Fix comment of tsquerysend()

The comment describes the order in which fields are sent, and it had one
of the fields in the wrong place.

This has been wrong since e6dbcb72fa (2008), so backpatch all the way
back.

Author: Emre Hasegeli <emre@hasegeli.com>
Discussion: https://postgr.es/m/CAE2gYzzf38bR_R=izhpMxAmqHXKeM5ajkmukh4mNs_oXfxcMCA@mail.gmail.com

src/backend/utils/adt/tsquery.c

@@ -1176,10 +1176,11 @@ tsqueryout(PG_FUNCTION_ARGS)
  *
  * uint8	type, QI_VAL
  * uint8	weight
- *			operand text in client encoding, null-terminated
  * uint8	prefix
+ *			operand text in client encoding, null-terminated
  *
  * For each operator:
+ *
  * uint8	type, QI_OPR
  * uint8	operator, one of OP_AND, OP_PHRASE OP_OR, OP_NOT.
  * uint16	distance (only for OP_PHRASE)