pgsql: doc: Update compatibility claim

doc: Update compatibility claim

Update outdated claim that TRUNCATE is a PostgreSQL extension.

Add cross-links between DELETE and TRUNCATE references pages.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5e86bb51eaeeb5c70f64102f46c4431cb12999e9

Modified Files
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doc/src/sgml/ref/delete.sgml | 11 +++++++++--
doc/src/sgml/ref/truncate.sgml | 8 ++++++++
2 files changed, 17 insertions(+), 2 deletions(-)

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