[SPARK-20942][WEB-UI]The title style about field is error in the history server web ui.

core/src/main/resources/org/apache/spark/ui/static/historypage-template.html

@@ -20,47 +20,47 @@
   <thead>
     <tr>
       <th>
-        <span data-toggle="tooltip" data-placement="right" title="ID of the application.">
+        <span data-toggle="tooltip" data-placement="top" title="ID of this application.">
           App ID
         </span>
       </th>
       <th>
-        <span data-toggle="tooltip" data-placement="above" title="Name of the application.">
+        <span data-toggle="tooltip" data-placement="top" title="Name of this application.">
           App Name
         </span>
       </th>
       <th class="attemptIDSpan">
-        <span data-toggle="tooltip" data-placement="above" title="The attempt ID of this application since one application might be launched several times">
+        <span data-toggle="tooltip" data-placement="top" title="The attempt ID of this application since one application might be launched several times">
           Attempt ID
         </span>
       </th>
       <th>
-        <span data-toggle="tooltip" data-placement="right" title="Started time of this application.">
+        <span data-toggle="tooltip" data-placement="top" title="Started time of this application.">
           Started
         </span>
       </th>
       <th class="completedColumn">
-        <span data-toggle="tooltip" data-placement="above" title="The completed time of this application.">
+        <span data-toggle="tooltip" data-placement="top" title="The completed time of this application.">
           Completed
         </span>
       </th>
       <th>
-        <span data-toggle="tooltip" data-placement="above" title="The duration time of this application.">
+        <span data-toggle="tooltip" data-placement="top" title="The duration time of this application.">
           Duration
         </span>
       </th>
       <th>
-        <span data-toggle="tooltip" data-placement="right" title="The Spark user of this application">
+        <span data-toggle="tooltip" data-placement="top" title="The Spark user of this application">
           Spark User
         </span>
       </th>
       <th>
-        <span data-toggle="tooltip" data-placement="above" title="The timestamp of the last updating on this application">
+        <span data-toggle="tooltip" data-placement="top" title="The timestamp of the last updating on this application">
           Last Updated
         </span>
       </th>
       <th>
-        <span data-toggle="tooltip" data-placement="above" title="Download the event log for this application">
+        <span data-toggle="tooltip" data-placement="top" title="Download the event log for this application">
           Event Log
         </span>
       </th>

core/src/main/resources/org/apache/spark/ui/static/historypage.js

@@ -195,7 +195,7 @@ $(document).ready(function() {
         }
 
         $(selector).DataTable(conf);
-        $('#hisotry-summary [data-toggle="tooltip"]').tooltip();
+        $('#history-summary [data-toggle="tooltip"]').tooltip();
       });
     });
 });