Documentation: replace strict_strtoul() with kstrtoul()

The usage of strict_strtoul() is not preferred, because
strict_strtoul() is obsolete. Thus, kstrtoul() should be
used.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index b937c6e..ea2d35d 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -735,7 +735,7 @@
 		 function as well as the function being traced.
 
   print-parent:
-   bash-4000  [01]  1477.606694: simple_strtoul <-strict_strtoul
+   bash-4000  [01]  1477.606694: simple_strtoul <-kstrtoul
 
   noprint-parent:
    bash-4000  [01]  1477.606694: simple_strtoul
@@ -759,7 +759,7 @@
             latency-format option is enabled.
 
     bash  4000 1 0 00000000 00010a95 [58127d26] 1720.415ms \
-    (+0.000ms): simple_strtoul (strict_strtoul)
+    (+0.000ms): simple_strtoul (kstrtoul)
 
   raw - This will display raw numbers. This option is best for
 	use with user applications that can translate the raw