minor typo

Author: minggli

pandas/core/internals/blocks.py

@@ -999,8 +999,8 @@ def putmask(self, mask, new, align=True, inplace=False, axis=0,
                         mask[mask].shape[-1] == len(new) or
                         len(new) == 1):
                     raise NotImplementedError(
-                        "Replace with array-like of mismatch length with mask "
-                        "is not supported.")
+                        "Replace with array-like of mismatch length to masked "
+                        "array is not supported.")
 
             np.putmask(new_values, mask, new)