Fix Rust entries

lib/docs/filters/rust/entries.rb

@@ -42,11 +42,14 @@ module Docs
             entries << [node.content, node['id']] unless node.content.include?('Note:')
           end
         else
-          css('#methods + * + div > .method', '#required-methods + div > .method', '#provided-methods + div > .method').map do |node|
+          css('.method')
+            .select {|node| !node.at_css('.fnname').nil?}
+            .map {|node|
               name = node.at_css('.fnname').content
               name.prepend "#{self.name}::"
               [name, node['id']]
-          end
+            }
+            .uniq {|item| item[0]}
         end
       end
     end