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bc292937ae6 failed to update a comment about unique index
checking. _bt_insertonpg() is no longer responsible for finding an
insertion location while preventing conflicting insertions.
* inserter can be making the check at one time. Furthermore, once we are
* past the check we hold write locks continuously until we have performed
* our insertion, so no later inserter can fail to see our insertion.
- * (This requires some care in _bt_insertonpg.)
+ * (This requires some care in _bt_findinsertloc.)
*
* If we must wait for another xact, we release the lock while waiting,
* and then must start over completely.