Code review for pg_stat_get_backend_activity_start patch --- fix

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 3b4ca4c0d9dd5807013a8404fc8283219f21f93b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-04-04T03:03:54Z
Releases: 7.4.1
Code review for pg_stat_get_backend_activity_start patch --- fix
return type, make protection condition agree with recent change to
pg_stat_get_backend_activity, clean up documentation.

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