Revert "Doc: move a dot outside double quotes (pythonGH-20007)"

This reverts commit 4eba677.

Author: deronnax

Doc/library/datetime.rst

@@ -35,7 +35,7 @@ on efficient attribute extraction for output formatting and manipulation.
 Aware and Naive Objects
 -----------------------
 
-Date and time objects may be categorized as "aware" or "naive".
+Date and time objects may be categorized as "aware" or "naive."
 
 With sufficient knowledge of applicable algorithmic and political time
 adjustments, such as time zone and daylight saving time information,