[PATCH] ALTER tab completion

Hi hackers,

I noticed that there are some tab completions missing for the following 
commands:
-ALTER DEFAULT PRIVILEGES: missing FOR USER
-ALTER FOREIGN DATA WRAPPER: missing NO HANDLER, NO VALIDATOR
-ALTER SEQUENCE: missing AS
-ALTER VIEW: no completion after ALTER COLUMN column_name
-ALTER TRANSFORM: no doc for ALTER TRANSFORM, so I excluded TRANSFORM 
from ALTER tab completion

I made a patch for this, so please have a look.

Best wishes,

-- 
Ken Kato
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION