Update datetimes.py

Following pandas-dev#42244 , improved documentation about datetime parsing.

See also pandas-dev#42229 (comment)

Author: smarie

pandas/core/tools/datetimes.py

@@ -763,7 +763,7 @@ def to_datetime(
         Return type depends on input:
 
         - list-like:
-            - DatetimeIndex, if timezone naive or aware with the same timezone
+            - DatetimeIndex, if timezone naive or aware with constant time offset
             - Index of object dtype, if timezone aware with mixed time offsets
         - Series: Series of datetime64 dtype
         - scalar: Timestamp