Apply refurb/ruff rule FURB125 (#11841)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

sphinx/directives/__init__.py

@@ -118,7 +118,7 @@ class ObjectDescription(SphinxDirective, Generic[ObjDescT]):
 
         *name* is whatever :meth:`handle_signature()` returned.
         """
-        return  # do nothing by default
+        pass  # do nothing by default
 
     def before_content(self) -> None:
         """

sphinx/search/__init__.py

@@ -508,7 +508,6 @@ class IndexBuilder:
                 word_store.title_words.extend(split(title))
             for child in node.children:
                 _visit_nodes(child)
-            return
 
         word_store = WordStore()
         split = self.lang.split