Rename dtrace probes for ongoing xlog -> wal conversion.

Robert Haas <rhaas@postgresql.org>

Commit: 3f01fd4ca0b4c81333b1f0dadb09c73aa589ab6e
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-02-09T21:40:19Z
Releases: 10.0
Rename dtrace probes for ongoing xlog -> wal conversion.

xlog-switch becomes wal-switch, and xlog-insert becomes wal-insert.

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Documentation touched