make some more space in add uri dialog

index.html

@@ -632,7 +632,6 @@
   </div>
   <form class="modal-body">
     <fieldset>
-      <legend>Download URIs</legend>
       <p class="help-block">
         - You can add multiple downloads (files)
         at the same time by putting uris for each
@@ -640,11 +639,7 @@
         - You can also add multiple uris (mirrors) for the
         *same* file. To do this separate the uris
         by a space. <br>
-        - Additional options can be specified for individual
-        files, in "--option[=value]" format. <br>
         - A URI can be HTTP(S)/FTP/BitTorrent Magnet URI. </br>
-        - Aria2 will use multiple uris (or mirrors) to boost
-        the download speed for that file (download). <br>
         E.g. To add 2 files (downloads) f1.jpg
         and f2.mp4 with 2 uris (mirrors) each,
         add uris as following: