Rename the parameter recovery_connections to hot_standby, to reduce possible

Tom Lane <tgl@sss.pgh.pa.us>

Commit: f0488bd57c3745b5dbed80e884ee5452e77314c9
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-04-29T21:36:19Z
Releases: 9.0.0
Rename the parameter recovery_connections to hot_standby, to reduce possible
confusion with streaming-replication settings.  Also, change its default
value to "off", because of concern about executing new and poorly-tested
code during ordinary non-replicating operation.  Per discussion.

In passing do some minor editing of related documentation.

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