Replace → markup with tabs.

examples.py

@@ -38,6 +38,9 @@ for example in sel.css('.example'):
     md = ''.join(example.css('.language-markdown *::text').getall())
     html = ''.join(example.css('.language-html *::text').getall())
 
+    md = md.replace('→', '    ')
+    html = html.replace('→', '    ')
+
     assert name is not None
 
     write(f'''