vue-router: fix notes

lib/docs/filters/vue_router/clean_html.rb

@@ -7,6 +7,13 @@ module Docs
         # Remove unneeded elements
         css('.bit-sponsor, .header-anchor').remove
 
+        css('.custom-block').each do |node|
+          node.name = 'blockquote'
+
+          title = node.at_css('.custom-block-title')
+          title.name = 'strong' unless title.nil?
+        end
+
         doc
       end
     end