pgsql: doc: fix incorrect 'literal' tags

doc: fix incorrect 'literal' tags

Discussion: dcc4113d-1eda-4f60-d1c5-f50eee160bad@gmail.com

Author: Alexander Law <exclusion@gmail.com>

Backpatch-through: 9.6

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/ff066481b0485b1a4e414de3abcaae0bda02b1e1

Modified Files
--------------
doc/src/sgml/pgstandby.sgml | 2 +-
doc/src/sgml/ref/pg_xlogdump.sgml | 2 +-
doc/src/sgml/ref/pgbench.sgml | 2 +-
doc/src/sgml/ref/psql-ref.sgml | 4 ++--
4 files changed, 5 insertions(+), 5 deletions(-)

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