Drop "meaning" column from error code table

This is currently the same as the condition name, so it doesn't add
any value, only clutter.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/420dcaaeb1a3be51b6417da59ce69d7954369211

Modified Files
--------------
doc/src/sgml/errcodes.sgml              |   15 ++++++---------
doc/src/sgml/generate-errcodes-table.pl |   11 ++---------
2 files changed, 8 insertions(+), 18 deletions(-)

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