pgsql: Fix incorrect markup in documentation of window frame clauses.

Fix incorrect markup in documentation of window frame clauses.

You're required to write either RANGE or ROWS to start a frame clause,
but the documentation incorrectly implied this is optional. Noted by
David Johnston.

Branch
------
REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/993674e80e511ac0c22a55c3261ce9760431cedc

Modified Files
--------------
doc/src/sgml/ref/select.sgml | 4 ++--
doc/src/sgml/syntax.sgml | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)

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