Fix comment in heapam.c
Improvement per suggestion from Tom Lane.
Author: Daniel Gustafsson
Discussion:
@@ -2145,7 +2145,7 @@ heap_multi_insert(Relation relation, TupleTableSlot **slots, int ntuples,
* that check MUST be done at least past the point of acquiring an
* exclusive buffer content lock on every buffer that will be affected,
* and MAY be done after all inserts are reflected in the buffers and
- * those locks are released; otherwise there race condition. Since
+ * those locks are released; otherwise there is a race condition. Since
* multiple buffers can be locked and unlocked in the loop below, and it
* would not be feasible to identify and lock all of those buffers before
* the loop, we must do a final check at the end.
