pgsql: Provide adequate documentation of the "table_name *" notation.

Provide adequate documentation of the "table_name *" notation.

Somewhere along the line, somebody decided to remove all trace of this
notation from the documentation text. It was still in the command syntax
synopses, or at least some of them, but with no indication what it meant.
This will not do, as evidenced by the confusion apparent in bug #7543;
even if the notation is now unnecessary, people will find it in legacy
SQL code and need to know what it does.

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/b853f33bcbfa3313d003b65d24946dfb04a8ff43

Modified Files
--------------
doc/src/sgml/config.sgml | 22 +++++++++++++++++-----
doc/src/sgml/ddl.sgml | 37 +++++++++++++++++++++----------------
doc/src/sgml/queries.sgml | 10 ++++++++++
doc/src/sgml/ref/alter_table.sgml | 12 +++++++-----
doc/src/sgml/ref/delete.sgml | 27 ++++++++-------------------
doc/src/sgml/ref/lock.sgml | 10 ++++++----
doc/src/sgml/ref/select.sgml | 33 ++++++++++++++++++++++-----------
doc/src/sgml/ref/truncate.sgml | 12 +++++++-----
doc/src/sgml/ref/update.sgml | 14 ++++++--------
9 files changed, 104 insertions(+), 73 deletions(-)