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
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/6753ced3104046340659db15626580bc49df617d

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(-)