add a link to building the manual in readme

README.md

@@ -33,7 +33,8 @@ Here are some quick links to the areas you might be interested in:
 2. [Contributing to the class reference](https://docs.godotengine.org/en/latest/community/contributing/updating_the_class_reference.html)
 3. [Content guidelines](https://docs.godotengine.org/en/latest/community/contributing/content_guidelines.html)
 4. [Writing guidelines](https://docs.godotengine.org/en/latest/community/contributing/docs_writing_guidelines.html)
-5. [Translating the documentation](https://docs.godotengine.org/en/latest/community/contributing/editor_and_docs_localization.html)
+5. [Building the manual](https://docs.godotengine.org/en/latest/community/contributing/building_the_manual.html)
+6. [Translating the documentation](https://docs.godotengine.org/en/latest/community/contributing/editor_and_docs_localization.html)
 
 ## License