[3.12] Fix indentation of "versionchanged" in datetime.rst (GH-114933) (GH-114937)

(cherry picked from commit b27812d)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Author: miss-islington

Doc/library/datetime.rst

@@ -1211,9 +1211,9 @@ Supported operations:
    attributes, the comparison acts as comparands were first converted to UTC
    datetimes except that the implementation never overflows.
 
-   .. versionchanged:: 3.3
-      Equality comparisons between aware and naive :class:`.datetime`
-      instances don't raise :exc:`TypeError`.
+.. versionchanged:: 3.3
+   Equality comparisons between aware and naive :class:`.datetime`
+   instances don't raise :exc:`TypeError`.
 
 Instance methods: