use list() to wrap range() in itertools.permutations() example; thanks to Romain MORLEVAT from docs@

dropped connections in case of simultaneous connection requests.

dropped connections in case of simultaneous connection requests.

Patch by sbt.

Issue12798 - Update mimetypes documentation. Correct the doc section where
common_types was mentioned under MimeTypes class, move it to helper function
category and other documentation improvements contributed by Sandro Tosi.