More whatsnew adds, especially the os module.

I went through all the versionchanged/versionadded tags in the os doc page for
this changeset.
diff --git a/Misc/NEWS b/Misc/NEWS
index f3189c2..32c862b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -3690,7 +3690,7 @@
   not installed. Instead, the zipfile.ZIP_STORED compression is used to create
   the ZipFile. Patch by Natalia B. Bidart.
 
-- Issue #11289: `smtp.SMTP` class becomes a context manager so it can be used
+- Issue #11289: `smtp.SMTP` class is now a context manager so it can be used
   in a `with` statement.  Contributed by Giampaolo Rodola.
 
 - Issue #11554: Fixed support for Japanese codecs; previously the body output
@@ -3702,7 +3702,7 @@
 - Issue #11407: `TestCase.run` returns the result object used or created.
   Contributed by Janathan Hartley.
 
-- Issue #11500: Fixed a bug in the os x proxy bypass code for fully qualified
+- Issue #11500: Fixed a bug in the OS X proxy bypass code for fully qualified
   IP addresses in the proxy exception list.
 
 - Issue #11491: dbm.error is no longer raised when dbm.open is called with