Fix typo (#639)

Author: eval

docs/cli.rst

@@ -2084,7 +2084,7 @@ Every option for this table (with the exception of ``--pk-none``) can be specifi
 ``--drop-foreign-key column``
     Drop the specified foreign key.
 
-``--add-foregn-key column other_table other_column``
+``--add-foreign-key column other_table other_column``
     Add a foreign key constraint to ``column`` pointing to ``other_table.other_column``.
 
 If you want to see the SQL that will be executed to make the change without actually executing it, add the ``--sql`` flag. For example: