Fix problems in commit c16dc1aca5.

Vinayak Pokale provided a patch for a copy-and-paste error in a
comment.  I noticed that I'd use the word "automatically" nearby where
I meant to talk about things being "atomic".  Rahila Syed spotted a
misplaced counter update.  Fix all that stuff.

src/backend/commands/vacuumlazy.c

@@ -1228,7 +1228,6 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
 
 	/* report that everything is scanned and vacuumed */
 	pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_SCANNED, blkno);
-	pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_VACUUMED, blkno);
 
 	pfree(frozen);
 
@@ -1287,7 +1286,8 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
 		vacrelstats->num_index_scans++;
 	}
 
-	/* report we're now in the cleanup phase */
+	/* report all blocks vacuumed; and that we're cleaning up */
+	pgstat_progress_update_param(PROGRESS_VACUUM_HEAP_BLKS_VACUUMED, blkno);
 	pgstat_progress_update_param(PROGRESS_VACUUM_PHASE,
 								 PROGRESS_VACUUM_PHASE_INDEX_CLEANUP);
 

src/backend/postmaster/pgstat.c

@@ -2903,7 +2903,7 @@ pgstat_progress_update_param(int index, int64 val)
 }
 
 /*-----------
- * pgstat_progress_update_params() -
+ * pgstat_progress_update_multi_param() -
  *
  * Automatically update multiple members in st_progress_param[] of own backend
  * entry.