Fix parse_date docstring spacing; use RFC role

There are only a three cases where a specific RFC is mentioned.
Only one is in parse_date and the others are elsewhere.

Author: EliahKagan

git/objects/commit.py

@@ -404,8 +404,8 @@ def trailers(self) -> Dict[str, str]:
     def trailers_list(self) -> List[Tuple[str, str]]:
         """Get the trailers of the message as a list.
 
-        Git messages can contain trailer information that are similar to RFC 822 e-mail
-        headers. See :manpage:`git-interpret-trailers(1)`.
+        Git messages can contain trailer information that are similar to :rfc:`822`
+        e-mail headers. See :manpage:`git-interpret-trailers(1)`.
 
         This function calls ``git interpret-trailers --parse`` onto the message to
         extract the trailer information, returns the raw trailer data as a list.
@@ -456,8 +456,8 @@ def trailers_list(self) -> List[Tuple[str, str]]:
     def trailers_dict(self) -> Dict[str, List[str]]:
         """Get the trailers of the message as a dictionary.
 
-        Git messages can contain trailer information that are similar to RFC 822 e-mail
-        headers. See :manpage:`git-interpret-trailers(1)`.
+        Git messages can contain trailer information that are similar to :rfc:`822`
+        e-mail headers. See :manpage:`git-interpret-trailers(1)`.
 
         This function calls ``git interpret-trailers --parse`` onto the message to
         extract the trailer information. The key value pairs are stripped of leading and

git/objects/util.py

@@ -223,9 +223,8 @@ def parse_date(string_date: Union[str, datetime]) -> Tuple[int, int]:
 
         * Aware datetime instance
         * Git internal format: timestamp offset
-        * RFC 2822: ``Thu, 07 Apr 2005 22:13:13 +0200``
-        * ISO 8601: ``2005-04-07T22:13:13``
-            The T can be a space as well.
+        * :rfc:`2822`: ``Thu, 07 Apr 2005 22:13:13 +0200``
+        * ISO 8601: ``2005-04-07T22:13:13`` - The ``T`` can be a space as well.
 
     :return:
         Tuple(int(timestamp_UTC), int(offset)), both in seconds since epoch