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
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/34405830517e2a4e5c3ab3f68cf3435f193944ae

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(-)