Correct broken links in docs

laravel/documentation/contrib/github.md

@@ -42,5 +42,5 @@ In order to keep the codebase clean, stable and at high quality, even with so ma
 
 *Further Reading*
 
- - [Contributing to Laravel via Command-Line](docs/contrib/command-line)
- - [Contributing to Laravel using TortoiseGit](docs/contrib/tortoisegit)
+ - [Contributing to Laravel via Command-Line](#contrib/command-line)
+ - [Contributing to Laravel using TortoiseGit](#contrib/tortoisegit)