linux-next: ftrace/docs: Fix spelling typos in ftrace-users.rst

This patch corrects some spelling typo in ftrace-users.rst

Signed-off-by: Masanari Iida <[e-mail]>
Acked-by: Steven Rostedt (VMware) <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/trace/ftrace-uses.rst

···
 Introduction
 ============
 
-The ftrace infrastructure was originially created to attach callbacks to the
+The ftrace infrastructure was originally created to attach callbacks to the
 beginning of functions in order to record and trace the flow of the kernel.
 But callbacks to the start of a function can have other use cases. Either
 for live kernel patching, or for security monitoring. This document describes
···
   This requires extra care to what can be done inside a callback. A callback
   can be called outside the protective scope of RCU.
 
-The ftrace infrastructure has some protections agains recursions and RCU
+The ftrace infrastructure has some protections against recursions and RCU
 but one must still be very careful how they use the callbacks.