pgsql: Minor hacking on contrib/cube documentation.

Minor hacking on contrib/cube documentation.

Improve markup, particularly of the table of functions; add or improve
examples for some of the functions; wordsmith some of the function
descriptions.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/e5e5267a91f4880c121bf50865cbc38078441989

Modified Files
--------------
doc/src/sgml/cube.sgml | 187 +++++++++++++++++++++++++++++++++---------------
1 file changed, 128 insertions(+), 59 deletions(-)

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