Clarify VACUUM FULL exclusion in total_vacuum_time docs

Hi,

Since last_vacuum and vacuum_count in pg_stat_all_tables explicitly mention
that they don't include VACUUM FULL ("not counting VACUUM FULL"), I think
we should add the same clarification to the description of total_vacuum_time.
This field also excludes VACUUM FULL, and without this note, users might
mistakenly think the time spent on VACUUM FULL is included. Thought?

         <structfield>total_vacuum_time</structfield> <type>double precision</type>
        </para>
        <para>
-       Total time this table has been manually vacuumed, in milliseconds.
+       Total time this table has been manually vacuumed, in milliseconds
+       (not counting <command>VACUUM FULL</command>).
         (This includes the time spent sleeping due to cost-based delays.)
        </para></entry>
       </row>

Regards,

-- 
Fujii Masao
NTT DATA Japan Corporation