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_2_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/1fe10463d9bd38d20b5c3c9356fc07ae9c3b6828

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

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