Fix a bunch of typos in documentation, docstrings and comments.
(From SF patch #810751)
diff --git a/Lib/test/test_errno.py b/Lib/test/test_errno.py
index 7869328..6b02e25 100755
--- a/Lib/test/test_errno.py
+++ b/Lib/test/test_errno.py
@@ -34,7 +34,7 @@
'EUSERS', 'EWOULDBLOCK', 'EXDEV', 'EXFULL']
#
-# This is is a wee bit bogus since the module only conditionally adds
+# This is a wee bit bogus since the module only conditionally adds
# errno constants if they have been defined by errno.h However, this
# test seems to work on SGI, Sparc & intel Solaris, and linux.
#