Get-AzResourceGroup - New example, and cleanup (#12828)

Added example on how to get resource groups based on tags, and removed duplicated examples. The two last examples has the same end result, but one piped the result into Where-Object which is not great based on basic PowerShell etiquette (Keep filtering to the left).

Author: roberthstrand

src/Resources/Resources/help/Get-AzResourceGroup.md

@@ -35,44 +35,42 @@ For more information about Azure resources and Azure resource groups, see the Ne
 
 ### Example 1: Get a resource group by name
 ```
-PS C:\>Get-AzResourceGroup -Name "EngineerBlog"
+PS C:\> Get-AzResourceGroup -Name "EngineerBlog"
 ```
 
 This command gets the Azure resource group in your subscription named EngineerBlog.
 
 ### Example 2: Get all tags of a resource group
 ```
-PS C:\>(Get-AzResourceGroup -Name "ContosoRG").Tags
+PS C:\> (Get-AzResourceGroup -Name "ContosoRG").Tags
 ```
 
 This command gets the resource group named ContosoRG, and displays the tags associated with that group.
 
-### Example 3: Show the Resource groups by location
+### Example 3: Get resource groups based on tag
+```
+PS C:\> Get-AzResourceGroup -Tag @{'environment'='prod'}
+```
+
+### Example 4: Show the Resource groups by location
 ```
 PS C:\> Get-AzResourceGroup |
   Sort Location,ResourceGroupName |
   Format-Table -GroupBy Location ResourceGroupName,ProvisioningState,Tags
 ```
 
-### Example 4: Show the names of all the Resource groups in a particular location
+### Example 5: Show the names of all the Resource groups in a particular location
 ```
 PS C:\> Get-AzResourceGroup -Location westus2 |
    Sort ResourceGroupName | 
    Format-Wide ResourceGroupName -Column 4
 ```
 
-### Example 5: Show the Resource groups whose names begin with WebServer
+### Example 6: Show the Resource groups whose names begin with WebServer
 ```
-PS C:\> Get-AzResourceGroup | Where ResourceGroupName -like WebServer*
+PS C:\> Get-AzResourceGroup -Name WebServer*
 ```
 
-### Example 6: Get a resource group by name
-```
-PS C:\> Get-AzResourceGroup -Name "EngineerBlog*"
-```
-
-This command gets the Azure resource group in your subscription that start with "EngineerBlog".
-
 ## PARAMETERS
 
 ### -ApiVersion