Help: Reference project command in CMAKE_PROJECT_INCLUDE_BEFORE relnotes

Help/release/dev/project-include-before.rst

@@ -2,4 +2,4 @@ cmake_project_include_before
 ----------------------------
 
 * A variable :variable:`CMAKE_PROJECT_INCLUDE_BEFORE` was added to allow
-  injection of custom code into the project.
+  injection of custom code before the :command:`project` call.