Update CONTRIBUTING.md - fixing link

fixing broken link

CONTRIBUTING.md

@@ -13,7 +13,7 @@ The best way to get started with a contribution is to start a dialog with us. So
 - Clone the repo - <https://github.com/microsoftgraph/msgraph-sdk-powershell.git>.
 - Identify the module(s) that you want add the custom cmdlets to. E.g. [Groups](https://github.com/microsoftgraph/msgraph-sdk-powershell/tree/dev/src/Groups/Groups).
 - Navigate to the module’s custom folder. E.g. [Groups/custom](https://github.com/microsoftgraph/msgraph-sdk-powershell/tree/dev/src/Groups/Groups/custom). In here, you will find a readme.md that has basic instructions on how to add custom cmdlets. A full guide can be found [here](https://github.com/Azure/autorest/blob/master/docs/powershell/customization.md#creating-a-new-cmdlet).
-- In the custom directory, add your custom cmdlet naming the file as `{Verb}Mg{Subject}_{Variant}.(cs|ps)`. This file will contain the implementation of your custom cmdlet. You can refer to [NewMgGroupMember_Create.cs](https://github.com/microsoftgraph/msgraph-sdk-powershell/blob/dev/src/Groups/Groups/custom/NewMgGroupMember_Create.cs) as an example.
+- In the custom directory, add your custom cmdlet naming the file as `{Verb}Mg{Subject}_{Variant}.(cs|ps)`. This file will contain the implementation of your custom cmdlet. You can refer to [NewMgGroupMember_Create.cs](https://github.com/microsoftgraph/msgraph-sdk-powershell/blob/dev/src/Groups/v1.0/custom/NewMgGroupMember_Create.cs) as an example.
 - Once done, bump up the module version number in the module’s root [readme.md](https://github.com/microsoftgraph/msgraph-sdk-powershell/blob/dev/src/Groups/Groups/readme.md#versioning) then run `.\msgraph-sdk-powershell\tools\GenerateModules.ps1 -Build` to create, build and export the cmdlets to `..\exports` folder.
 
 ## Modifying Existing Cmdlets