Issue #26736: Used HTTPS for external links in the documentation if possible.

diff --cc Doc/c-api/init.rst
Simple merge

diff --cc Doc/faq/programming.rst
Simple merge

diff --cc Doc/library/collections.abc.rst
Simple merge

diff --cc Doc/library/collections.rst
Simple merge

diff --cc Doc/library/datetime.rst
Simple merge

diff --cc Doc/library/imaplib.rst
Simple merge

diff --cc Doc/library/sys.rst
Simple merge

diff --cc Doc/reference/lexical_analysis.rst
Simple merge

diff --cc Doc/tutorial/stdlib.rst
Simple merge

diff --cc Doc/using/mac.rst
Simple merge

diff --cc Misc/NEWS
Simple merge