serverStatus.metrics.getLastError.wtime.num description typo

The description for serverStatus.metrics.getLastError.wtime.num states it tracks operations "without a specified write concern". I believe this should be "with a specified write concern" instead as "wtime" tracks operations with a write concern.

Signed-off-by: Sam Kleinman <samk@10gen.com>
DOCS-1534: State that HTTP Console does not support Kerberos authentication

Signed-off-by: Sam Kleinman <samk@10gen.com>