Update README.md (#8684)

The last two commits to this file "broke" both  "Developing and contributing"(link is missing) and "Support" (don't know what it didn't format correctly.
This commit fixes both cases.

README.md

@@ -199,11 +199,13 @@ If you are developing .NET Core C# applications targeting PowerShell Core, pleas
 
 Also make sure to check out our [PowerShell-RFC repository](https://github.com/powershell/powershell-rfc) for request-for-comments (RFC) documents to submit and give comments on proposed and future designs.
 
+[Contribution Guide]: https://github.com/PowerShell/PowerShell/blob/master/.github/CONTRIBUTING.md
 [check out our FAQ]: https://github.com/PowerShell/PowerShell/tree/master/docs/FAQ.md#where-do-i-get-the-powershell-core-sdk-package
 
 ## Support  
 
-For support please see the [Support Section][].  
+For support please see the [Support Section][].
+
 [Support Section]: https://github.com/PowerShell/PowerShell/tree/master/.github/SUPPORT.md
 
 ## Legal and Licensing