fix comma location in various places (GH-19233)

(cherry picked from commit c49016e67c3255b37599b354a8d7995d40663991)

Co-authored-by: Mathieu Dupuy <deronnax@users.noreply.github.com>
diff --git a/Doc/library/textwrap.rst b/Doc/library/textwrap.rst
index 0f11ef4..1683710 100644
--- a/Doc/library/textwrap.rst
+++ b/Doc/library/textwrap.rst
@@ -239,7 +239,7 @@
       :attr:`fix_sentence_endings` is false by default.
 
       Since the sentence detection algorithm relies on ``string.lowercase`` for
-      the definition of "lowercase letter," and a convention of using two spaces
+      the definition of "lowercase letter", and a convention of using two spaces
       after a period to separate sentences on the same line, it is specific to
       English-language texts.