docs(typing): add "see PEP 675" to LiteralString (pythonGH-97926)

(cherry picked from commit 2016bc5)

Co-authored-by: Simon Legner <[email protected]>

Author: simon04

Doc/library/typing.rst

@@ -631,6 +631,8 @@ These can be used as types in annotations and do not support ``[]``.
    that generate type checker errors could be vulnerable to an SQL
    injection attack.
 
+   See :pep:`675` for more details.
+
    .. versionadded:: 3.11
 
 .. data:: Never