Fix a few comments that referred to copy.c.

Missed these in the previous commit.

src/backend/libpq/pqcomm.c

@@ -1626,7 +1626,7 @@ socket_endcopyout(bool errorAbort)
 		return;
 	if (errorAbort)
 		pq_putbytes("\n\n\\.\n", 5);
-	/* in non-error case, copy.c will have emitted the terminator line */
+	/* in non-error case, copyto.c will have emitted the terminator line */
 	DoingCopyOut = false;
 }
 

src/include/commands/trigger.h

@@ -44,7 +44,7 @@ typedef struct TriggerData
 
 /*
  * The state for capturing old and new tuples into transition tables for a
- * single ModifyTable node (or other operation source, e.g. copy.c).
+ * single ModifyTable node (or other operation source, e.g. copyfrom.c).
  *
  * This is per-caller to avoid conflicts in setting
  * tcs_original_insert_tuple.  Note, however, that the pointed-to
@@ -69,8 +69,8 @@ typedef struct TransitionCaptureState
 	 * For INSERT and COPY, it would be wasteful to convert tuples from child
 	 * format to parent format after they have already been converted in the
 	 * opposite direction during routing.  In that case we bypass conversion
-	 * and allow the inserting code (copy.c and nodeModifyTable.c) to provide
+	 * and allow the inserting code (copyfrom.c and nodeModifyTable.c) to
-	 * a slot containing the original tuple directly.
+	 * provide a slot containing the original tuple directly.
 	 */
 	TupleTableSlot *tcs_original_insert_tuple;
 

src/include/nodes/execnodes.h

@@ -498,7 +498,7 @@ typedef struct ResultRelInfo
 	 */
 	TupleConversionMap *ri_ChildToRootMap;
 
-	/* for use by copy.c when performing multi-inserts */
+	/* for use by copyfrom.c when performing multi-inserts */
 	struct CopyMultiInsertBuffer *ri_CopyMultiInsertBuffer;
 } ResultRelInfo;
 

src/test/regress/expected/triggers.out

@@ -2904,7 +2904,7 @@ NOTICE:  trigger = child3_delete_trig, old table = (CCC,42,foo)
 copy parent (a, b) from stdin;
 NOTICE:  trigger = parent_insert_trig, new table = (AAA,42), (BBB,42), (CCC,42)
 -- same behavior for copy if there is an index (interesting because rows are
--- captured by a different code path in copy.c if there are indexes)
+-- captured by a different code path in copyfrom.c if there are indexes)
 create index on parent(b);
 copy parent (a, b) from stdin;
 NOTICE:  trigger = parent_insert_trig, new table = (DDD,42)

src/test/regress/sql/triggers.sql

@@ -2112,7 +2112,7 @@ CCC	42
 \.
 
 -- same behavior for copy if there is an index (interesting because rows are
--- captured by a different code path in copy.c if there are indexes)
+-- captured by a different code path in copyfrom.c if there are indexes)
 create index on parent(b);
 copy parent (a, b) from stdin;
 DDD	42