fix exemple js data in help/web_hook

app/views/hooks/_data_ex.html.erb

 <% data_ex_str = <<eos
 {
-        :before => "95790bf891e76fee5e1747ab589903a6a1f80f22",
-         :after => "da1560886d4f094c3e6c9ef40349f7d38b5d27d7",
-           :ref => "refs/heads/master",
-       :user_id => 4,
-     :user_name => "John Smith",
-    :repository => {
-               :name => "Diaspora",
-                :url => "git@localhost:diaspora.git",
-        :description => "",
-           :homepage => "http://localhost/diaspora",
+  "before": "95790bf891e76fee5e1747ab589903a6a1f80f22",
+  "after": "da1560886d4f094c3e6c9ef40349f7d38b5d27d7",
+  "ref": "refs/heads/master",
+  "user_id": 4,
+  "user_name": "John Smith",
+  "repository": {
+    "name": "Diaspora",
+    "url": "git@localhost:diaspora.git",
+    "description": "",
+    "homepage": "http://localhost/diaspora",
   },
-       :commits => [
-        [0] {
-                   :id => "450d0de7532f8b663b9c5cce183b...",
-              :message => "Update Catalan translation to e38cb41.",
-            :timestamp => "2011-12-12T14:27:31+02:00",
-                  :url => "http://localhost/diaspora/commits/450d0de7532f...",
-               :author => {
-                 :name => "Jordi Mallach",
-                :email => "jordi@softcatala.org"
+  "commits": [
+    {
+      "id": "b6568db1bc1dcd7f8b4d5a946b0b91f9dacd7327",
+      "message": "Update Catalan translation to e38cb41.",
+      "timestamp": "2011-12-12T14:27:31+02:00",
+      "url": "http://localhost/diaspora/commits/b6568db1bc1dcd7f8b4d5a946b0b91f9dacd7327",
+      "author": {
+        "name": "Jordi Mallach",
+        "email": "jordi@softcatala.org",
       }
     },
-
-        ....
-
-        [3] {
-                   :id => "da1560886d4f094c3e6c9ef40349...",
-              :message => "fixed readme",
-            :timestamp => "2012-01-03T23:36:29+02:00",
-                  :url => "http://localhost/diaspora/commits/da1560886d...",
-               :author => {
-                 :name => "GitLab dev user",
-                :email => "gitlabdev@dv6700.(none)"
-            }
-        }
+    // ...
+    {
+      "id": "da1560886d4f094c3e6c9ef40349f7d38b5d27d7",
+      "message": "fixed readme",
+      "timestamp": "2012-01-03T23:36:29+02:00",
+      "url": "http://localhost/diaspora/commits/da1560886d4f094c3e6c9ef40349f7d38b5d27d7",
+      "author": {
+        "name": "GitLab dev user",
+        "email": "gitlabdev@dv6700.(none)",
+      },
+    },
   ],
-   total_commits_count => 4
-}
+  "total_commits_count": 4,
+};
 eos
 %>
-<% js_lexer = Pygments::Lexer[:js] %>
-<%= raw js_lexer.highlight(data_ex_str) %>
+<div class="white">
+  <%= raw Pygments::Lexer[:js].highlight(data_ex_str) %>
+</div>