Refer to max_wal_senders in a more consistent fashion.

Robert Haas <rhaas@postgresql.org>

Commit: 54943734f8fca3a9092564f31a7c9c6b8a58c7bc
Author: Robert Haas <rhaas@postgresql.org>
Date: 2010-04-01T00:43:29Z
Releases: 9.0.0
Refer to max_wal_senders in a more consistent fashion.

The error message now makes explicit reference to the GUC that must be changed
to fix the problem, using wording suggested by Tom Lane.  Along the way,
rename the GUC from MaxWalSenders to max_wal_senders for consistency and
grep-ability.

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