[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/email.header.rst b/Doc/library/email.header.rst
index 07152c2..e093f13 100644
--- a/Doc/library/email.header.rst
+++ b/Doc/library/email.header.rst
@@ -116,7 +116,7 @@
if *s* is a byte string.
- .. method:: encode(splitchars=';, \\t', maxlinelen=None, linesep='\\n')
+ .. method:: encode(splitchars=';, \t', maxlinelen=None, linesep='\n')
Encode a message header into an RFC-compliant format, possibly wrapping
long lines and encapsulating non-ASCII parts in base64 or quoted-printable