Обсуждение: pgsql: docs: improve description of how to handle multiple databases

docs:  improve description of how to handle multiple databases

This is a redesign of the intro to the managing databases chapter.

Discussion: https://postgr.es/m/159586122762.680.1361378513036616007@wrigleys.postgresql.org

Author: David G. Johnston

Backpatch-through: 9.5

Branch
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REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ac0ad75bf7748b09cd9507d05f110549211f68ca

Modified Files
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doc/src/sgml/manage-ag.sgml | 50 +++++++++++++++++++++++++++++++--------------
1 file changed, 35 insertions(+), 15 deletions(-)