Fix a typo in highres.txt

A small patch for the highres timers documentation:

Signed-off-by: Will newton <will.newton@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/hrtimers/highres.txt b/Documentation/hrtimers/highres.txt
index ce0e9a9..a73ecf5 100644
--- a/Documentation/hrtimers/highres.txt
+++ b/Documentation/hrtimers/highres.txt
@@ -98,7 +98,7 @@
 event devices are used to provide local CPU functionality such as process
 accounting, profiling, and high resolution timers.
 
-The management layer assignes one or more of the folliwing functions to a clock
+The management layer assigns one or more of the following functions to a clock
 event device:
       - system global periodic tick (jiffies update)
       - cpu local update_process_times