bpo-42153 Fix link to IMAP documents in imaplib.rst (GH-23297)

The University of Washington stopped hosting the IMAP documents. Link to a rescued copy on GitHub.
diff --git a/Doc/library/imaplib.rst b/Doc/library/imaplib.rst
index 02ecfd9..65681ec 100644
--- a/Doc/library/imaplib.rst
+++ b/Doc/library/imaplib.rst
@@ -174,9 +174,9 @@
 
 .. seealso::
 
-   Documents describing the protocol, and sources and binaries  for servers
-   implementing it, can all be found at the University of Washington's *IMAP
-   Information Center* (https://www.washington.edu/imap/).
+   Documents describing the protocol, sources for servers
+   implementing it, by the University of Washington's IMAP Information Center
+   can all be found at (**Source Code**) https://github.com/uw-imap/imap (**Not Maintained**).
 
 
 .. _imap4-objects:
diff --git a/Misc/NEWS.d/next/Documentation/2020-11-15-13-46-31.bpo-42153.KjBhx3.rst b/Misc/NEWS.d/next/Documentation/2020-11-15-13-46-31.bpo-42153.KjBhx3.rst
new file mode 100644
index 0000000..0a9451a
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2020-11-15-13-46-31.bpo-42153.KjBhx3.rst
@@ -0,0 +1 @@
+Fix the URL for the IMAP protocol documents.