allow for one warning during phpdoc check.

we need to make amends for the fact that our plugin name and its db
tables have divergent names. tool_ilioscategoryassignment was/is too
long!
the code linter dings us for this, and i don't see how to suppress this
check, so let's allow for exactly one failure.

.github/workflows/ci.yml

@@ -78,7 +78,7 @@ jobs:
 
       - name: Moodle PHPDoc Checker
         if: ${{ !cancelled() }}
-        run: moodle-plugin-ci phpdoc --max-warnings 0
+        run: moodle-plugin-ci phpdoc --max-warnings 1
 
       - name: Validating
         if: ${{ !cancelled() }}