bpo-40939: Generate keyword.py using the new parser (GH-20800)

(cherry picked from commit 9727694f08cad4b019d2939224e3416312b1c0e1)

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 628f9fc..a5368bf 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -1817,6 +1817,7 @@
         'False': '',
         'None': '',
         'True': '',
+        '__new_parser__': '',
         'and': 'BOOLEAN',
         'as': 'with',
         'assert': ('assert', ''),