Tweak heapam's rmgr desc output slightly

Some spaces were missing, and putting the affected tuple offset first in
the lock cases instead of the locking data makes more sense.

No backpatch since this is cosmetic and surrounding code has changed.

src/backend/access/rmgrdesc/heapdesc.c

@@ -48,15 +48,14 @@ heap_desc(StringInfo buf, XLogReaderState *record)
 	{
 		xl_heap_delete *xlrec = (xl_heap_delete *) rec;
 
-		appendStringInfo(buf, "off %u", xlrec->offnum);
-		appendStringInfoChar(buf, ' ');
+		appendStringInfo(buf, "off %u ", xlrec->offnum);
 		out_infobits(buf, xlrec->infobits_set);
 	}
 	else if (info == XLOG_HEAP_UPDATE)
 	{
 		xl_heap_update *xlrec = (xl_heap_update *) rec;
 
-		appendStringInfo(buf, "off %u xmax %u",
+		appendStringInfo(buf, "off %u xmax %u ",
 						 xlrec->old_offnum,
 						 xlrec->old_xmax);
 		out_infobits(buf, xlrec->old_infobits_set);
@@ -68,7 +67,7 @@ heap_desc(StringInfo buf, XLogReaderState *record)
 	{
 		xl_heap_update *xlrec = (xl_heap_update *) rec;
 
-		appendStringInfo(buf, "off %u xmax %u",
+		appendStringInfo(buf, "off %u xmax %u ",
 						 xlrec->old_offnum,
 						 xlrec->old_xmax);
 		out_infobits(buf, xlrec->old_infobits_set);
@@ -80,8 +79,7 @@ heap_desc(StringInfo buf, XLogReaderState *record)
 	{
 		xl_heap_lock *xlrec = (xl_heap_lock *) rec;
 
-		appendStringInfo(buf, "xid %u: ", xlrec->locking_xid);
-		appendStringInfo(buf, "off %u ", xlrec->offnum);
+		appendStringInfo(buf, "off %u: xid %u ", xlrec->offnum, xlrec->locking_xid);
 		out_infobits(buf, xlrec->infobits_set);
 	}
 	else if (info == XLOG_HEAP_INPLACE)
@@ -133,9 +131,8 @@ heap2_desc(StringInfo buf, XLogReaderState *record)
 	{
 		xl_heap_lock_updated *xlrec = (xl_heap_lock_updated *) rec;
 
-		appendStringInfo(buf, "xmax %u msk %04x; ", xlrec->xmax,
-						 xlrec->infobits_set);
-		appendStringInfo(buf, "off %u", xlrec->offnum);
+		appendStringInfo(buf, "off %u: xmax %u ", xlrec->offnum, xlrec->xmax);
+		out_infobits(buf, xlrec->infobits_set);
 	}
 	else if (info == XLOG_HEAP2_NEW_CID)
 	{