[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/functions.rst b/Doc/library/functions.rst
index 24dc65d..0598a6c 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1334,7 +1334,7 @@
       supported.
 
 
-.. function:: print(*objects, sep=' ', end='\\n', file=sys.stdout, flush=False)
+.. function:: print(*objects, sep=' ', end='\n', file=sys.stdout, flush=False)
 
    Print *objects* to the text stream *file*, separated by *sep* and followed
    by *end*.  *sep*, *end*, *file* and *flush*, if present, must be given as keyword