gh-85453: Improve instance attributes mark up on datetime.rst (#123655)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: uatach

Doc/library/datetime.rst

@@ -283,17 +283,23 @@ Class attributes:
 Note that, because of normalization, ``timedelta.max`` is greater than ``-timedelta.min``.
 ``-timedelta.max`` is not representable as a :class:`timedelta` object.
 
+
 Instance attributes (read-only):
 
-+------------------+--------------------------------------------+
-| Attribute        | Value                                      |
-+==================+============================================+
-| ``days``         | Between -999999999 and 999999999 inclusive |
-+------------------+--------------------------------------------+
-| ``seconds``      | Between 0 and 86399 inclusive              |
-+------------------+--------------------------------------------+
-| ``microseconds`` | Between 0 and 999999 inclusive             |
-+------------------+--------------------------------------------+
+.. attribute:: timedelta.days
+
+   Between -999,999,999 and 999,999,999 inclusive.
+
+
+.. attribute:: timedelta.seconds
+
+   Between 0 and 86,399 inclusive.
+
+
+.. attribute:: timedelta.microseconds
+
+   Between 0 and 999,999 inclusive.
+
 
 Supported operations: