doc(contributing): add note about doc tag usage

Add a notice so contributors do not spam the doc tag unnecessarily for
all changes.

Signed-off-by: Randolph Sapp <[email protected]>

Author: StaticRocket

CONTRIBUTING.md

@@ -11,6 +11,11 @@ not strictly enforced.
 Please see the following for additional resources on commit formatting:
 https://www.conventionalcommits.org/en/v1.0.0/
 
+> [!NOTE]
+> This entire project is documentation. Using the doc tag for all changes is not
+> helpful. Please reserve usage of the doc tag for changes to this projects
+> documentation, such as the README or CONTRIBUTING documents.
+
 ## Project structure
 
 This project uses reStructuredText (reST or RST) for generating standard HTML