Some documentation

Far from complete, and probably needs a bit of work, but it's a start.

Signed-off-by: Travis Ralston <travpc@gmail.com>

src/components/views/rooms/RoomSettings.js

@@ -595,6 +595,7 @@ module.exports = React.createClass({
         const isGlobalBlacklistUnverified = SettingsStore.getValue("blacklistUnverifiedDevices");
         const isRoomBlacklistUnverified = this._isRoomBlacklistUnverified();
 
+        // TODO: {Travis} Convert to blacklistUnverifiedDevices with SettingsFlag
         const settings =
             <label>
                 <input type="checkbox" ref="blacklistUnverified"