Fixed typo in documentation.
Correct the quopri module documentation. Mention the correct types of the
parameters on encodestring and decodestring.

Patch by Petri Lehtinen.
issue20753 - robotparser tests should not rely upon external resource when not required.

Specifically, it was relying a URL which gave HTTP 403 and used it to assert
it's methods, this changes undoes that and provides a local http server with
similar properties.

Patch contributed by Vajrasky Kok.
Closes #20872: dbm/gdbm/ndbm close methods are not documented
MERGE: Closes #20872: dbm/gdbm/ndbm close methods are not documented