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_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/e3f87aae9316d42ece1912d1cae34ec0ba8142c8

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

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