Website: Fix 404 paths in docs (#9923)

Author: TuvalSimha

website/src/pages/docs/custom-codegen/contributing.mdx

@@ -33,7 +33,7 @@ GraphQL Code Generator uses the following stack to manage the source code:
 
 ## 2. Fork and Clone
 
-Start by [creating a Fork of the `dotansimha/graphql-code-generator-community` repository](https://help.github.com/en/github/getting-started-with-github/fork-a-repo); this will allow you to make changes and push them quickly later: [`dotansimha/graphql-code-generator-community`](dotansimha/graphql-code-generator-community).
+Start by [creating a Fork of the `dotansimha/graphql-code-generator-community` repository](https://help.github.com/en/github/getting-started-with-github/fork-a-repo); this will allow you to make changes and push them quickly later: [`dotansimha/graphql-code-generator-community`](https://github.com/dotansimha/graphql-code-generator-community).
 
 Then, use Git [to clone](https://help.github.com/en/github/creating-cloning-and-archiving-repositories/cloning-a-repository-from-github) your newly created fork repository.