Fix mkdocs.yml: exclude_docs expects multiline string

Author: sun

mkdocs.yml

@@ -88,8 +88,8 @@ nav:
   - Developers:
       - Plugin Development: docs/developers/plugin_development_guide.md
 
-exclude_docs:
-  - venv/*
-  - .github/*
-  - src/*
-  - plugins/*
+exclude_docs: |
+  venv/*
+  .github/*
+  src/*
+  plugins/*