Update mkdocs.yml (#1307)

rename release note url path

mkdocs.yml

@@ -542,7 +542,7 @@ nav:
 
   - Appendix:
       - Learning path: 20.appendix/learning-path.md
-      - Release Note: 20.appendix/releasenote.md
+      - Release Note: 20.appendix/release-notes.md
       - FAQ: 20.appendix/0.FAQ.md
       - Ecosystem tools: 20.appendix/6.eco-tool-version.md
       - Write tools: 20.appendix/write-tools.md