Trivial spelling fixes for Kconfig help text of config HWLAT_TRACER.

Fixes: e7c15cd8 ("tracing: Added hardware latency tracer")
Signed-off-by: NJesper Dangaard Brouer <brouer@redhat.com>
Acked-by: NSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>