Fix lightning tour example

website/docs/usage/lightning-tour.jade

@@ -148,24 +148,20 @@ p
 
 +code.
     def put_spans_around_tokens(doc, get_classes):
-        '''Given some function to compute class names, put each token in a
-        span element, with the appropriate classes computed.
-
-        All whitespace is preserved, outside of the spans. (Yes, I know HTML
-        won't display it. But the point is no information is lost, so you can
-        calculate what you need, e.g. <br /> tags, <p> tags, etc.)
-        '''
+        """Given some function to compute class names, put each token in a
+        span element, with the appropriate classes computed. All whitespace is
+        preserved, outside of the spans. (Of course, HTML won't display more than
+        one whitespace character it – but the point is, no information is lost
+        and you can calculate what you need, e.g. &lt;br /&gt;, &lt;p&gt; etc.)
+        """
         output = []
-        template = '<span classes="{classes}">{word}</span>{space}'
+        html = '&lt;span class="{classes}"&gt;{word}&lt;/span&gt;{space}'
         for token in doc:
             if token.is_space:
-                output.append(token.orth_)
+                output.append(token.text)
             else:
-                output.append(
-                  template.format(
-                    classes=' '.join(get_classes(token)),
-                    word=token.orth_,
-                    space=token.whitespace_))
+                classes = ' '.join(get_classes(token))
+                output.append(html.format(classes=classes, word=token.text, space=token.whitespace_))
         string = ''.join(output)
         string = string.replace('\n', '')
         string = string.replace('\t', '    ')