Renaming Get-PnPWebhooksubscriptions to singular notation to align with the other cmdlets. Added an alias for backwards compatibility. (#3551)

Co-authored-by: Gautam Sheth <gautamdsheth@outlook.com>

Author: KoenZomers

documentation/Get-PnPWebhookSubscriptions.md renamed to documentation/Get-PnPWebhookSubscription.md

@@ -1,21 +1,21 @@
 ---
 Module Name: PnP.PowerShell
-title: Get-PnPWebhookSubscriptions
+title: Get-PnPWebhookSubscription
 schema: 2.0.0
 applicable: SharePoint Online
 external help file: PnP.PowerShell.dll-Help.xml
-online version: https://pnp.github.io/powershell/cmdlets/Get-PnPWebhookSubscriptions.html
+online version: https://pnp.github.io/powershell/cmdlets/Get-PnPWebhookSubscription.html
 ---
 
-# Get-PnPWebhookSubscriptions
+# Get-PnPWebhookSubscription
 
 ## SYNOPSIS
 Gets all the Webhook subscriptions of the resource
 
 ## SYNTAX
 
 ```powershell
-Get-PnPWebhookSubscriptions [-List <ListPipeBind>] [-Connection <PnPConnection>]
+Get-PnPWebhookSubscription [-List <ListPipeBind>] [-Connection <PnPConnection>]
  
 ```
 
@@ -27,14 +27,14 @@ Allows to retrieve Webhook subscriptions of specified list.
 
 ### EXAMPLE 1
 ```powershell
-Get-PnPWebhookSubscriptions -List MyList
+Get-PnPWebhookSubscription -List MyList
 ```
 
 Gets all Webhook subscriptions of the list MyList
 
 ### EXAMPLE 2
 ```powershell
-Get-PnPList | Get-PnPWebhookSubscriptions
+Get-PnPList | Get-PnPWebhookSubscription
 ```
 
 Gets all Webhook subscriptions of the all the lists

src/Commands/Webhooks/GetWebhookSubscriptions.cs renamed to src/Commands/Webhooks/GetWebhookSubscription.cs

@@ -7,9 +7,10 @@
 
 namespace PnP.PowerShell.Commands.Webhooks
 {
-    [Cmdlet(VerbsCommon.Get, "PnPWebhookSubscriptions")]
+    [Alias("Get-PnPWebhookSubscriptions")]
+    [Cmdlet(VerbsCommon.Get, "PnPWebhookSubscription")]
     [OutputType(typeof(WebhookSubscription))]
-    public class GetWebhookSubscriptions : PnPWebCmdlet
+    public class GetWebhookSubscription : PnPWebCmdlet
     {
         [Parameter(Mandatory = false, ValueFromPipeline = true)]
         public ListPipeBind List;