kobject: Make Documentation/kobject.txt a little more coherent.

While reading Documentation/kobject.txt:

  Note kobject_rename does perform any locking or have a solid notion of
  what names are valid so the provide must provide their own sanity checking
  and serialization.

I expect better: You never see me hard with time word making sentence
coherent stuff.  Ever.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Documentation/kobject.txt

@@ -118,8 +118,8 @@ the name of the kobject, call kobject_rename():
 
     int kobject_rename(struct kobject *kobj, const char *new_name);
 
-Note kobject_rename does perform any locking or have a solid notion of
-what names are valid so the provide must provide their own sanity checking
+kobject_rename does not perform any locking or have a solid notion of
+what names are valid so the caller must provide their own sanity checking
 and serialization.
 
 There is a function called kobject_set_name() but that is legacy cruft and