PEP 8: Allow both one and two spaces after period

Authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Author: hugovk

pep-0008.txt

@@ -705,7 +705,7 @@ letter (never alter the case of identifiers!).
 Block comments generally consist of one or more paragraphs built out of
 complete sentences, with each sentence ending in a period.
 
-You should use two spaces after a sentence-ending period in multi-
+You should use one or two spaces after a sentence-ending period in multi-
 sentence comments, except after the final sentence.
 
 Ensure that your comments are clear and easily understandable to other