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_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/7efc08dec9c737e92388fe2665f2bc1d4e3c1970

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

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