Change the style in admin notice content view from <p> to <pre> (#11301)

That's because many notic have more than one lines. So I think
pre is more better to used in here than p

Signed-off-by: a1012112796 <1012112796@qq.com>

templates/admin/notice.tmpl

@@ -77,7 +77,7 @@
 	<i class="close icon"></i>
 	<div class="header">{{$.i18n.Tr "admin.notices.view_detail_header"}}</div>
 	<div class="content">
-		<p></p>
+		<pre></pre>
 	</div>
 </div>
 {{template "base/footer" .}}

web_src/js/index.js

@@ -2019,7 +2019,7 @@ function initAdmin() {
 
     // Attach view detail modals
     $('.view-detail').on('click', function () {
-      $detailModal.find('.content p').text($(this).data('content'));
+      $detailModal.find('.content pre').text($(this).data('content'));
       $detailModal.modal('show');
       return false;
     });