DOC: clarify that Index.equals(non_index) returns False (pandas-dev#27105)

closes pandas-dev#14411

Author: toobaz

pandas/core/indexes/base.py

@@ -4170,7 +4170,8 @@ def equals(self, other):
         Returns
         -------
         bool
-            If two Index objects have equal elements True, otherwise False.
+            True if "other" is an Index and it has the same elements as calling
+            index; False otherwise.
         """
         if self.is_(other):
             return True