Fix Vale warnings in three guides (#50357)

- Getting started guide for auto-discovering Kubernetes applications.
- DynamoDB (as an application) guide. This change does not address one
  Vale warning with `tsh aws dymamodb`, which is a false positive.
- Getting started guide for protecting applications.

Author: ptgott

docs/pages/enroll-resources/application-access/getting-started.mdx

@@ -1,6 +1,6 @@
 ---
-title: Getting Started with Teleport Application Access
-description: Getting started with Teleport application access.
+title: Protect a Web Application with Teleport
+description: Provides instructions to set up the Teleport Application Service and enable secure access to a web application.
 videoBanner: cvW4b96aPL0
 ---
 
@@ -20,6 +20,21 @@ At a high level, configuring access for applications involves the following step
 - Install and configure Teleport on the application host.
 - Add a user to verify access to the application.
 
+## How it works
+
+In the setup we demonstrate in this guide, the Teleport Application Service
+joins your Teleport cluster with a secure token. You configure the Application
+Service to protect a web application using a configuration file. After the
+Application Service joins the cluster, the Teleport Proxy Service routes
+requests from end users to the Teleport Application Service, and responses from
+the Application Serve back to end users. 
+
+The Application Service authenticates user requests by validating a JSON web
+token (JWT) in the request against a CA maintained by the Teleport Auth Service.
+The requesting user's roles are encoded in the JWT, allowing the Application
+Service to determine whether the user has permissions to make a request to a
+Teleport-protected application.
+
 ## Prerequisites
 
 For this tutorial, verify your environment meets the following requirements:
@@ -179,7 +194,7 @@ $ helm install teleport-kube-agent teleport/teleport-kube-agent \
 - Change `apps[0].name` and `apps[0].uri` if you're configuring access to a different 
 web application.
 
-Make sure that the Teleport agent pod is running. You should see one
+Make sure that the Teleport Agent pod is running. You should see one
 `teleport-kube-agent` pod with a single ready container:
 
 ```code
@@ -203,8 +218,9 @@ To assign to the `access` role to a new local user named `alice`, run the follow
 $ tctl users add --roles=access alice
 ```
 
-The command generates an invitation URL for the new user. You can use the URL to choose 
-a password, set up a second factor for authentication, and sign in to the Teleport Web UI.
+The command generates an invitation URL for the new user. You can use the URL to
+choose a password, set up multi-factor authentication, and sign in to the
+Teleport Web UI.
 
 ## Step 5/5. Access the application
 
@@ -225,5 +241,5 @@ Learn more about protecting applications with Teleport in the following topics:
 - [Connecting applications](./guides/connecting-apps.mdx).
 - Integrating with [JWT tokens](./jwt/introduction.mdx).
 - Accessing applications with [RESTful APIs](./guides/api-access.mdx).
-- Setting configuration options AND running CLI commands in the [Application Access reference](../../reference/agent-services/application-access.mdx).
+- Setting configuration options AND running CLI commands in the [Application Service reference](../../reference/agent-services/application-access.mdx).
 - Using the Let's Encrypt [ACME protocol](https://letsencrypt.org/how-it-works/).

docs/pages/enroll-resources/application-access/guides/dynamodb.mdx

@@ -22,15 +22,15 @@ This guide will help you to:
 
 </Tabs>
 
-<Admonition type="warning" title="Recommendation: Use the Teleport Database
-Service">
+## How it works
 
 The Teleport Application Service enables secure access to DynamoDB via its
 [integration](../cloud-apis/aws-console.mdx) with the AWS management console and
 API. This is an alternative to accessing DynamoDB through the Teleport Database
-service, as described in our [Database Access with AWS
-DynamoDB](../../database-access/enroll-aws-databases/aws-dynamodb.mdx) guide.
+service, as described in our [Protect Amazon DynamoDB with
+Teleport](../../database-access/enroll-aws-databases/aws-dynamodb.mdx) guide.
 
+<Admonition type="warning">
 The Application Service's integration with AWS is not designed specifically for
 DynamoDB, while the Database Service has a purpose-built DynamoDB integration.
 As a result, we recommend using the Database Service to enable secure access to
@@ -40,7 +40,6 @@ It is worth noting that the Database Service will allow you to connect with GUI
 clients, whereas the Application Service does not. On the other hand, a single
 Application Service configuration can access DynamoDB across regions, while
 database resources must be configured for each region with DynamoDB databases.
-
 </Admonition>
 
 ## Prerequisites
@@ -173,6 +172,6 @@ $ tsh apps logout aws
 ```
 
 ## Next steps
-- More information on [AWS Management and API with Teleport Application Access](../../application-access/cloud-apis/aws-console.mdx).
+- More information on [protecting AWS Console with Teleport](../../application-access/cloud-apis/aws-console.mdx).
 - Learn more about [AWS service endpoints](https://docs.aws.amazon.com/general/latest/gr/rande.html).
 

docs/pages/enroll-resources/auto-discovery/kubernetes-applications/get-started.mdx

@@ -11,6 +11,14 @@ setup step.
 
 In this guide, we show you how to enable Kubernetes application auto-discovery.
 
+## How it works
+
+The Teleport Discovery Service queries the API server of the Kubernetes cluster
+in which you want to detect applications, maintaining dynamic `app` resources to
+match the Kubernetes services that it detects within the cluster. The Teleport
+Application Service queries the Teleport Auth Service to fetch `app` resources,
+and proxies applications based the dynamically generated configuration.
+
 ## Prerequisites
 
 (!docs/pages/includes/edition-prereqs-tabs.mdx!)
@@ -26,7 +34,7 @@ In this guide, we show you how to enable Kubernetes application auto-discovery.
 
 ## Step 1/2. Create a join token
 
-Create a join token for a new Teleport agent that will run the Teleport
+Create a join token for a new Teleport Agent that will run the Teleport
 Kubernetes Service, Application Service, and Discovery Service:
 
 ```code
@@ -40,15 +48,15 @@ Teleport applications created from discovered Kubernetes services.
 
 ## Step 2/2. Deploy the agent
 
-If you want to install a new Teleport agent in your Kubernetes cluster, you can
-use the `teleport-kube-agent` Helm chart. If you already have a Teleport agent
+If you want to install a new Teleport Agent in your Kubernetes cluster, you can
+use the `teleport-kube-agent` Helm chart. If you already have a Teleport Agent
 installed, you can upgrade it to enable the Kubernetes Application Discovery
 by adding the `kube`, `app`, and `discovery` to roles as shown below.
 
 <Tabs>
 <TabItem label="Install a new agent">
 
-Deploy a new Teleport agent running your configured services by installing the
+Deploy a new Teleport Agent running your configured services by installing the
 `teleport-kube-agent` Helm chart:
 
 ```code