kcsan: Fix trivial typo in Kconfig help comments

Fix trivial typo in Kconfig help comments in KCSAN_SKIP_WATCH and
KCSAN_SKIP_WATCH_RANDOMIZE
Signed-off-by: Ryosuke Yasuoka <ryasuoka@redhat.com>
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

lib/Kconfig.kcsan

@@ -125,7 +125,7 @@ config KCSAN_SKIP_WATCH
 	default 4000
 	help
 	  The number of per-CPU memory operations to skip, before another
-	  watchpoint is set up, i.e. one in KCSAN_WATCH_SKIP per-CPU
+	  watchpoint is set up, i.e. one in KCSAN_SKIP_WATCH per-CPU
 	  memory operations are used to set up a watchpoint. A smaller value
 	  results in more aggressive race detection, whereas a larger value
 	  improves system performance at the cost of missing some races.
@@ -135,8 +135,8 @@ config KCSAN_SKIP_WATCH_RANDOMIZE
 	default y
 	help
 	  If instruction skip count should be randomized, where the maximum is
-	  KCSAN_WATCH_SKIP. If false, the chosen value is always
-	  KCSAN_WATCH_SKIP.
+	  KCSAN_SKIP_WATCH. If false, the chosen value is always
+	  KCSAN_SKIP_WATCH.
 
 config KCSAN_INTERRUPT_WATCHER
 	bool "Interruptible watchers" if !KCSAN_STRICT