use relative link

Author: sailro

gamedev/unity/troubleshooting/troubleshooting-and-known-issues-visual-studio-tools-for-unity.md

@@ -95,7 +95,7 @@ When using the new Unity runtime, .NET targeting packs version 4.6 or 4.7.1 are
 
 ## Assembly reference or project property issues
 
-If your project is complex reference-wise or if you want to better control this generation step, you can use our [API](docs/gamedev/unity/extensibility/customize-project-files-created-by-vstu.md) for manipulating the generated project or solution content. You can also use [response files](https://docs.unity3d.com/Manual/PlatformDependentCompilation.html) in your Unity project and we'll process them.
+If your project is complex reference-wise or if you want to better control this generation step, you can use our [API](../extensibility/customize-project-files-created-by-vstu.md) for manipulating the generated project or solution content. You can also use [response files](https://docs.unity3d.com/Manual/PlatformDependentCompilation.html) in your Unity project and we'll process them.
 
 With recent Visual Studio and Unity versions, the best approach seems to use a custom `Directory.Build.props` file along with your generated projects. You will then be able to contribute to the project structure without interfering with the generation process. More information [here](https://docs.microsoft.com/visualstudio/msbuild/customize-your-build#directorybuildprops-and-directorybuildtargets).