[doc] Fix erroneous backslashes in signatures and names (GH-23658)
The issue being resolved is shown in the 3.10 docs (if you select docs for older versions you won't see a visual glitch).
The newer sphinx version that produces the 3.10 docs doesn't treat the backslash to escape things in some situations it previously did.
diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index a481a35..9c1743c 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -491,7 +491,7 @@
Available Context Managers
--------------------------
-.. class:: catch_warnings(\*, record=False, module=None)
+.. class:: catch_warnings(*, record=False, module=None)
A context manager that copies and, upon exit, restores the warnings filter
and the :func:`showwarning` function.