Fix typo in comment.

freedesktop_notifications/src/com/dmdirc/addons/freedesktop_notifications/FDManager.java

             try {
                 myProcess.waitFor();
             } catch (InterruptedException e) {
-                //Not a proble, carry on
+                //Not a problem, carry on
             }
             return true;
         } catch (SecurityException | IOException e) {