pgsql: Make placeholders in SQL command help more consistent and precis

Make placeholders in SQL command help more consistent and precise

To avoid divergent names on related pages, avoid ambiguities, and
reduce translation work a little.

Branch
------
REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/1178fdfb80aef3332ba9e9653e84de07dd7f029b

Modified Files
--------------
doc/src/sgml/ref/alter_aggregate.sgml | 8 ++++----
doc/src/sgml/ref/alter_extension.sgml | 10 +++++-----
doc/src/sgml/ref/alter_foreign_table.sgml | 24 ++++++++++++------------
doc/src/sgml/ref/alter_sequence.sgml | 4 ++--
doc/src/sgml/ref/alter_server.sgml | 8 ++++----
doc/src/sgml/ref/alter_table.sgml | 26 +++++++++++++-------------
doc/src/sgml/ref/alter_trigger.sgml | 4 ++--
doc/src/sgml/ref/alter_view.sgml | 4 ++--
doc/src/sgml/ref/analyze.sgml | 6 +++---
doc/src/sgml/ref/copy.sgml | 18 +++++++++---------
doc/src/sgml/ref/create_database.sgml | 4 ++--
doc/src/sgml/ref/create_extension.sgml | 4 ++--
doc/src/sgml/ref/create_index.sgml | 12 ++++++------
doc/src/sgml/ref/create_rule.sgml | 4 ++--
doc/src/sgml/ref/create_sequence.sgml | 4 ++--
doc/src/sgml/ref/create_table.sgml | 16 ++++++++--------
doc/src/sgml/ref/create_table_as.sgml | 6 +++---
doc/src/sgml/ref/create_trigger.sgml | 4 ++--
doc/src/sgml/ref/delete.sgml | 6 +++---
doc/src/sgml/ref/drop_aggregate.sgml | 4 ++--
doc/src/sgml/ref/drop_extension.sgml | 4 ++--
doc/src/sgml/ref/drop_rule.sgml | 4 ++--
doc/src/sgml/ref/drop_server.sgml | 4 ++--
doc/src/sgml/ref/drop_tablespace.sgml | 4 ++--
doc/src/sgml/ref/drop_trigger.sgml | 4 ++--
doc/src/sgml/ref/grant.sgml | 4 ++--
doc/src/sgml/ref/insert.sgml | 15 +++++++--------
doc/src/sgml/ref/revoke.sgml | 4 ++--
doc/src/sgml/ref/update.sgml | 16 ++++++++--------
doc/src/sgml/ref/vacuum.sgml | 10 +++++-----
30 files changed, 122 insertions(+), 123 deletions(-)