Removed an extra quote

IPython/frontend/html/notebook/static/pagedown/Markdown.Converter.js

@@ -1193,7 +1193,7 b' else'
 
             //  autolink anything like <http://example.com>
             
-            var replacer = function (wholematch, m1) { return "<a href=\"" + m1 + "\" target=\"_blank\"">" + pluginHooks.plainLinkText(m1) + "</a>"; }
+            var replacer = function (wholematch, m1) { return "<a href=\"" + m1 + "\" target=\"_blank\">" + pluginHooks.plainLinkText(m1) + "</a>"; }
             text = text.replace(/<((https?|ftp):[^'">\s]+)>/gi, replacer);
 
             // Email addresses: <[e-mail]>