fix(docs): correct duplicated words in submodule and util docstrings

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Jah-yee

git/objects/submodule/root.py

@@ -352,7 +352,7 @@ def update(  # type: ignore[override]
                                         # change easily.
                                         _logger.warning(
                                             "Current sha %s was not contained in the tracking\
-             branch at the new remote, setting it the the remote's tracking branch",
+             branch at the new remote, setting it to the remote's tracking branch",
                                             sm.hexsha,
                                         )
                                         sm.binsha = rref.commit.binsha

git/util.py

@@ -1392,7 +1392,7 @@ def iter_items(cls, repo: "Repo", *args: Any, **kwargs: Any) -> Iterator[T_Itera
 
         Subclasses can specify `args` and `kwargs` differently, and may use them for
         filtering. However, when the method is called with no additional positional or
-        keyword arguments, subclasses are obliged to to yield all items.
+        keyword arguments, subclasses are obliged to yield all items.
 
         :return:
             Iterator yielding Items