Fix typos (#1223)

guides/https.md

@@ -51,7 +51,7 @@ The `cacertfile` option is not needed when using a self-signed certificate, or w
   keyfile: "/etc/letsencrypt/live/example.net/privkey.pem"
 ```
 
-It is possible to bundle the certificate files with the  application, possibly for packaging into a release. In this case the files must be stored under the application's 'priv' directory. The `otp_app` option must be set to the name of the OTP application that contains the files, in order to correctly resolve the relative paths:
+It is possible to bundle the certificate files with the application, possibly for packaging into a release. In this case the files must be stored under the application's 'priv' directory. The `otp_app` option must be set to the name of the OTP application that contains the files, in order to correctly resolve the relative paths:
 
 ```elixir
 Plug.Cowboy.https MyApp.MyPlug, [],

lib/plug/rewrite_on.ex

@@ -10,10 +10,10 @@ defmodule Plug.RewriteOn do
 
   The supported values are:
 
-    * `:x_forwarded_for` - to override the remote ip based on on the "x-forwarded-for" header
-    * `:x_forwarded_host` - to override the host based on on the "x-forwarded-host" header
-    * `:x_forwarded_port` - to override the port based on on the "x-forwarded-port" header
-    * `:x_forwarded_proto` - to override the protocol based on on the "x-forwarded-proto" header
+    * `:x_forwarded_for` - to override the remote ip based on the "x-forwarded-for" header
+    * `:x_forwarded_host` - to override the host based on the "x-forwarded-host" header
+    * `:x_forwarded_port` - to override the port based on the "x-forwarded-port" header
+    * `:x_forwarded_proto` - to override the protocol based on the "x-forwarded-proto" header
 
   A tuple representing a Module-Function-Args can also be given as argument
   instead of a list.

lib/plug/static.ex

@@ -167,7 +167,8 @@ defmodule Plug.Static do
     %{
       encodings: encodings,
       only_rules: {Keyword.get(opts, :only, []), Keyword.get(opts, :only_matching, [])},
-      qs_cache: Keyword.get(opts, :cache_control_for_vsn_requests, "public, max-age=31536000, immutable"),
+      qs_cache:
+        Keyword.get(opts, :cache_control_for_vsn_requests, "public, max-age=31536000, immutable"),
       et_cache: Keyword.get(opts, :cache_control_for_etags, "public"),
       et_generation: Keyword.get(opts, :etag_generation, nil),
       headers: Keyword.get(opts, :headers, %{}),