pgsql: docs: clarify SSL certificate authority chain docs

docs: clarify SSL certificate authority chain docs

Previously, the requirements of how intermediate certificates were
handled and their chain to root certificates was unclear.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/fa4add50c4ea97c48881fa8cb3863df80141643c

Modified Files
--------------
doc/src/sgml/libpq.sgml | 16 +++++++++-------
doc/src/sgml/runtime.sgml | 18 +++++++++++-------
2 files changed, 20 insertions(+), 14 deletions(-)

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