Fix some newly modified tab-complete changes

Hi hackers,

I saw a problem when using tab-complete for "GRANT", "TABLES IN SCHEMA" should
be "ALL TABLES IN SCHEMA" in the following case.

postgres=# grant all on
ALL FUNCTIONS IN SCHEMA DATABASE FUNCTION PARAMETER SCHEMA TABLESPACE
ALL PROCEDURES IN SCHEMA DOMAIN information_schema. PROCEDURE SEQUENCE tbl
ALL ROUTINES IN SCHEMA FOREIGN DATA WRAPPER LANGUAGE public. TABLE TYPE
ALL SEQUENCES IN SCHEMA FOREIGN SERVER LARGE OBJECT ROUTINE TABLES IN SCHEMA

I found that it is related to the recent commit 790bf615dd, and maybe it's
better to fix it. I also noticed that some comments should be modified according
to this new syntax. Attach a patch to fix them.

Regards,
Shi yu