Rename standby_keep_segments to wal_keep_segments.

Robert Haas <rhaas@postgresql.org>

Commit: 481cb5d9b506069a6fbe2a7069b576e8eb2f2cde
Author: Robert Haas <rhaas@postgresql.org>
Date: 2010-04-20T11:15:06Z
Releases: 9.0.0
Rename standby_keep_segments to wal_keep_segments.

Also, make the name of the GUC and the name of the backing variable match.
Alnong the way, clean up a couple of slight typographical errors in the
related docs.

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