Обсуждение: pgsql: upgrade docs: highlight pg_upgrade, warn about globals preserva

upgrade docs:  highlight pg_upgrade, warn about globals preservation

Also, remove OID preservation mention, mention non-text dump formats

Backpatch through 9.4

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/3a3d3f9ec01f1f7333e3bbcd5ba9398fd19ad8d9

Modified Files
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doc/src/sgml/backup.sgml  |   27 ++++++++++++++------------
doc/src/sgml/runtime.sgml |   47 ++++++++++++++++++++++++++++-----------------
2 files changed, 44 insertions(+), 30 deletions(-)