Fix sentinel.conf typo

Closes redis#1739

Author: badboy

sentinel.conf

@@ -29,7 +29,7 @@ port 26379
 # dir <working-directory>
 # Every long running process should have a well-defined working directory.
 # For Redis Sentinel to chdir to /tmp at startup is the simplest thing
-# for the process to don't interferer with administrative tasks such as
+# for the process to don't interfere with administrative tasks such as
 # unmounting filesystems.
 dir /tmp