pgsql: Clarify documentation about "peer" rows in window functions

Clarify documentation about "peer" rows in window functions

Peer rows are matching rows when ORDER BY is specified.

Report by arnaud.mouronval@gmail.com, David G Johnston

Backpatch through 9.4

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/a6d9b331aaa1bccd740700954c15bd56727189ad

Modified Files
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doc/src/sgml/func.sgml | 3 ++-
doc/src/sgml/ref/select.sgml | 7 ++++---
doc/src/sgml/syntax.sgml | 4 ++--
3 files changed, 8 insertions(+), 6 deletions(-)

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