ktest: Fix some typos in sample.conf

This patch fixes some spelling typo in sample.conf

Link: http://lkml.kernel.org/r/20190930124925.20250-1-standby24x7@gmail.com



Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>