DOC: Improve df.equals() docstring (#56458)

* DOC: Improve df.equals() docstring

* Update generic.py

* Update

Author: linus-md

pandas/core/generic.py

@@ -1451,8 +1451,8 @@ def equals(self, other: object) -> bool_t:
         the same location are considered equal.
 
         The row/column index do not need to have the same type, as long
-        as the values are considered equal. Corresponding columns must be of
-        the same dtype.
+        as the values are considered equal. Corresponding columns and
+        index must be of the same dtype.
 
         Parameters
         ----------