Fix example in Remove-AzGalleryImageVersion.md (#11777)

3rd and 4th argument names in the only example were incorrect and don't match the syntax outline on the rest of the page.

Author: BillSproule

src/Compute/Compute/help/Remove-AzGalleryImageVersion.md

@@ -38,7 +38,7 @@ Delete a gallery image version.
 
 ### Example 1
 ```powershell
-PS C:\> Remove-AzGalleryImageVersion -ResourceGroupName $rgname -GalleryName $gallery -ImageDefinitionName $image -GalleryImageVersionName $version
+PS C:\> Remove-AzGalleryImageVersion -ResourceGroupName $rgname -GalleryName $gallery -GalleryImageDefinitionName $image -Name $version
 ```
 
 Delete the given gallery image version.