Fix typo in heapam.c
Author: Hou Zhijie
Discussion:
@@ -2356,7 +2356,7 @@ heap_prepare_insert(Relation relation, HeapTuple tup, TransactionId xid,
}
/*
- * heap_multi_insert - insert multiple tuple into a heap
+ * heap_multi_insert - insert multiple tuples into a heap
*
* This is like heap_insert(), but inserts multiple tuples in one operation.
* That's faster than calling heap_insert() in a loop, because when multiple
