Refer to contributing guidelines in building documentation

For #771.

docs/building/linux.md

@@ -58,6 +58,9 @@ uninstall prior any prior versions.
 Git Setup
 ---------
 
+Using Git requires it to be setup correctly; refer to the
+[Contributing Guidelines](../../CONTRIBUTING.md).
+
 Please clone the superproject (this repo) and initialize a subset of
 the submodules:
 

docs/building/windows-core.md

@@ -46,6 +46,9 @@ CLI can cause odd failures when running. Please check your version.
 Git Setup
 ---------
 
+Using Git requires it to be setup correctly; refer to the
+[Contributing Guidelines](../../CONTRIBUTING.md).
+
 Please clone the superproject (this repo) and initialize a subset of
 the submodules: