Multiindex drop doc improvement (#43813)

Author: juliandwain

pandas/core/frame.py

@@ -4972,6 +4972,10 @@ def drop(
                 weight  1.0     0.8
                 length  0.3     0.2
 
+        Drop a specific index combination from the MultiIndex
+        DataFrame, i.e., drop the combination ``'falcon'`` and
+        ``'weight'``, which deletes only the corresponding row
+
         >>> df.drop(index=('falcon', 'weight'))
                         big     small
         lama    speed   45.0    30.0