gh-37470: src/sage_docbuild/ext/sage_autodoc.py: Fix linter failure
    
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Fixes linter failure as seen in https://github.com/sagemath/sage/actions
/runs/8038811469/job/21955149914?pr=37464#step:8:17


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URL: #37470
Reported by: Matthias Köppe
Reviewer(s): Kwankyu Lee

Author: Release Manager

src/sage_docbuild/ext/sage_autodoc.py

@@ -113,7 +113,7 @@ def identity(x: Any) -> Any:
 
 
 class _All:
-    """A special value for :*-members: that matches to any member."""
+    """A special value for ``:*-members:`` that matches to any member."""
 
     def __contains__(self, item: Any) -> bool:
         return True