nbtree: Fix obsolete _bt_search() comment.
Oversight in commit
@@ -83,8 +83,8 @@ _bt_drop_lock_and_maybe_pin(IndexScanDesc scan, BTScanPos sp)
* but it can omit the rightmost column(s) of the index.
*
* Return value is a stack of parent-page pointers. *bufP is set to the
- * address of the leaf-page buffer, which is read-locked and pinned.
- * No locks are held on the parent pages, however!
+ * address of the leaf-page buffer, which is locked and pinned. No locks
+ * are held on the parent pages, however!
*
* If the snapshot parameter is not NULL, "old snapshot" checking will take
* place during the descent through the tree. This is not needed when
