pgsql: docs: add mention of index swapping

docs: add mention of index swapping

Backpatch to 9.3

Greg Smith

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b1cbd2b573edc690bdb75cf25fe31037c8126b2f

Modified Files
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doc/src/sgml/maintenance.sgml | 22 ++++++++++++++++++++--
doc/src/sgml/ref/create_index.sgml | 2 +-
2 files changed, 21 insertions(+), 3 deletions(-)

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