pgsql: doc: Remove some trailing whitespace

doc: Remove some trailing whitespace

Per discussion, we will not at this time remove trailing whitespace in
psql output displays where it is part of the actual psql output.

From: Vladimir Rusinov <vrusinov@google.com>

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b645a05fc6112a4857ceac574d4aa24174a70417

Modified Files
--------------
doc/src/sgml/config.sgml | 2 +-
doc/src/sgml/parallel.sgml | 22 +++++++++++-----------
doc/src/sgml/ref/alter_table.sgml | 2 +-
doc/src/sgml/ref/insert.sgml | 2 +-
doc/src/sgml/ref/prepare.sgml | 2 +-
doc/src/sgml/ref/reindexdb.sgml | 2 +-
6 files changed, 16 insertions(+), 16 deletions(-)

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