Change aliases to work around mypy issue.

Fixes #1934
Note this should also gives better LSP support to these property aliases.

git/remote.py

@@ -828,8 +828,15 @@ def remove(cls, repo: "Repo", name: str) -> str:
             name._clear_cache()
         return name
 
-    # `rm` is an alias.
-    rm = remove
+    @classmethod
+    def rm(cls, repo: "Repo", name: str) -> str:
+        """Alias of remove.
+        Remove the remote with the given name.
+
+        :return:
+            The passed remote name to remove
+        """
+        return cls.remove(repo, name)
 
     def rename(self, new_name: str) -> "Remote":
         """Rename self to the given `new_name`.

git/repo/base.py

@@ -402,6 +402,17 @@ def heads(self) -> "IterableList[Head]":
         """
         return Head.list_items(self)
 
+    @property
+    def branches(self) -> "IterableList[Head]":
+        """Alias for heads.
+        A list of :class:`~git.refs.head.Head` objects representing the branch heads
+        in this repo.
+
+        :return:
+            ``git.IterableList(Head, ...)``
+        """
+        return self.heads
+
     @property
     def references(self) -> "IterableList[Reference]":
         """A list of :class:`~git.refs.reference.Reference` objects representing tags,
@@ -412,11 +423,16 @@ def references(self) -> "IterableList[Reference]":
         """
         return Reference.list_items(self)
 
-    # Alias for references.
-    refs = references
+    @property
+    def refs(self) -> "IterableList[Reference]":
+        """Alias for references.
+        A list of :class:`~git.refs.reference.Reference` objects representing tags,
+        heads and remote references.
 
-    # Alias for heads.
-    branches = heads
+        :return:
+            ``git.IterableList(Reference, ...)``
+        """
+        return self.references
 
     @property
     def index(self) -> "IndexFile":