Fix "Python" casing in a few places (GH-9001)
diff --git a/Doc/library/imaplib.rst b/Doc/library/imaplib.rst
index 2e2c59c..040dab6 100644
--- a/Doc/library/imaplib.rst
+++ b/Doc/library/imaplib.rst
@@ -517,7 +517,7 @@
create such tags. Although it is an RFC violation and IMAP clients and
servers are supposed to be strict, imaplib nonetheless continues to allow
such tags to be created for backward compatibility reasons, and as of
- python 3.6, handles them if they are sent from the server, since this
+ Python 3.6, handles them if they are sent from the server, since this
improves real-world compatibility.
.. method:: IMAP4.subscribe(mailbox)