livepatch: samples: fix usage example comments

Fix a few typos in the livepatch-sample.c usage example comments and add
some whitespace to make the comments a little more legible.
Reported-by: NUdo Seidel <udoseidel@gmx.de>
Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

samples/livepatch/livepatch-sample.c

@@ -26,12 +26,16 @@
  * kernel boot cmdline when /proc/cmdline is read.
  *
  * Example:
+ *
  * $ cat /proc/cmdline
  * <your cmdline>
+ *
  * $ insmod livepatch-sample.ko
  * $ cat /proc/cmdline
  * this has been live patched
- * $ echo 0 > /sys/kernel/livepatch/klp_sample/enabled
+ *
+ * $ echo 0 > /sys/kernel/livepatch/livepatch_sample/enabled
+ * $ cat /proc/cmdline
  * <your cmdline>
  */