be more explicit that GitHub repository, not just project, per review

Co-authored-by: Christoph Kuhnke <[email protected]>

Author: ArBridgeman

doc/user_guide/features/metrics/sonar.rst

@@ -50,7 +50,7 @@ Configuration
 
 .. _configure_sonar_private_project:
 
-**Private** project
+**Private** GitHub repository
 ^^^^^^^^^^^^^^^^^^^
 .. note::
     As of 2025-07-29, we do not currently have a private project configured. Thus,