Issue #23921: Standardized documentation whitespace formatting.

Original patch by James Edwards.

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/contextlib.rst
Simple merge

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

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

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

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

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

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

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

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

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

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

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

diff --cc Doc/tutorial/stdlib2.rst
Simple merge