Fixed typo in documentation.
Merged documentation update from 3.4.
Correct the quopri module documentation. Mention the correct types of the
parameters on encodestring and decodestring.

Patch by Petri Lehtinen.
merge from 3.4

issue15588 - 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.
merge from 3.4

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
MERGE: Closes #20872: dbm/gdbm/ndbm close methods are not documented