fix comment

Author: mrzimu

src/uproot/behaviors/TBranch.py

@@ -2490,7 +2490,7 @@ def streamer(self):
                         "fClonesName", none_if_missing=True
                     ) == self.member(
                         "fParentName"
-                    ):  # Use `self.member("fParentName")` since `fClassName` could contain spaces between brackets.
+                    ):  # Use `self.member("fParentName")` since `fClonesName` could contain spaces between brackets.
                         self._streamer_isTClonesArray = True
 
             elif fClassName is not None and fClassName != "":