Update build_docker_and_trigger_metplus.yml

The docs directory was moved up to the top-level of the repository but this workflow was not updated. Changing the ignore setting so that doc-only updates do not trigger the full METplus testing workflow.

.github/workflows/build_docker_and_trigger_metplus.yml

@@ -5,7 +5,7 @@ on:
     branches:
       - develop
     paths-ignore:
-      - 'met/docs/**'
+      - 'docs/**'
 
   workflow_dispatch: