tracehook: comment pasto fixes

Fix some pasto's in comments in the new linux/tracehook.h and
asm-generic/syscall.h files.

Reported-by: Wenji Huang <wenji.huang@oracle.com>
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-generic/syscall.h b/include/asm-generic/syscall.h
index abcf34c..ea8087b 100644
--- a/include/asm-generic/syscall.h
+++ b/include/asm-generic/syscall.h
@@ -126,7 +126,7 @@
  * @args:	array of argument values to store
  *
  * Changes @n arguments to the system call starting with the @i'th argument.
- * @n'th argument to @val.  Argument @i gets value @args[0], and so on.
+ * Argument @i gets value @args[0], and so on.
  * An arch inline version is probably optimal when @i and @n are constants.
  *
  * It's only valid to call this when @task is stopped for tracing on