pgsql: Fix document bug regarding read only transactions.

Fix document bug regarding read only transactions.

It was explained that read only transactions (not in standby) allow to
update sequences. This had been wrong since the commit:
05d8a561ff85db1545f5768fe8d8dc9d99ad2ef7

Discussion: /messages/by-id/20170614.110826.425627939780392324.t-ishii@sraoss.co.jp

Branch
------
REL9_3_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/5eaee9b4c4af3c3cc7f52f921e03512699dcd887

Modified Files
--------------
doc/src/sgml/high-availability.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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