Closes #22675: fix typo.

--HG--
branch : 3.4
merge with 3.4
Docs: 'os.pwrite()' needs bytes, not strings

--HG--
branch : 3.4
extra : amend_source : ba2e45f880e67bc3eaed7a153a85f12791aacf5a
MERGE: Docs: 'os.pwrite()' needs bytes, not strings
Issue #22660: update various mentions in the ssl module documentation.

--HG--
branch : 3.4
extra : amend_source : e7bd7c9c8945b841c5a99538475aad3981d63181
Issue #22660: update various mentions in the ssl module documentation.