added a bit of additional information on the bid edit page

bookshare/trades/templates/bid_edit.html

@@ -10,7 +10,7 @@ SRCT Bookshare • {{ bid.listing.title }} • Edit Bid
   <div class="row">
     <div class="col-lg-12 text-center">
       <h1><strong>SRCT</strong>&#8203;BOOKSHARE</h1>
-      <p class="lead text-center"><strong>Edit Bid for <em>{{ bid.listing.title }}</em></strong></p>
+      <p class="lead text-center"><strong>Edit Your Bid for {{ bid.listing.poster.user.get_full_name }}'s Listing <em>{{ bid.listing.title }}</em></strong></p>
     </div>
   </div>
 </div>