fix typo in comment

src/main/java/net/floodlightcontroller/core/internal/RoleManager.java

@@ -30,7 +30,7 @@ import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  * switch(-channel) so it can notify the switches of role changes.
  *
  * We need to ensure that every connected switch is always send the
- * correct role. Therefore, switch add, sending of the intial role, and
+ * correct role. Therefore, switch add, sending of the initial role, and
  * changing role need to use mutexes to ensure this. This has the ugly
  * side-effect of requiring calls between controller and OFChannelHandler
  *