Update Octave documentation (6.4.0)

lib/docs/filters/octave/entries.rb

@@ -13,7 +13,7 @@ module Docs
 
       def additional_entries
         css('dl:not([compact]) > dt').each_with_object [] do |node, entries|
-          name = node.content.gsub(/[A-z0-9\,… ]*\=/, '').strip.split(' ')[0]
+          name = node.content.gsub(/^: +/, '').gsub(/[A-z0-9\,… ]*\=/, '').strip.split(' ')[0]
           entries << [name, node['id'], 'Functions'] unless node['id'] =~ /-\d+\Z/
         end
       end

lib/docs/scrapers/octave.rb

@@ -30,7 +30,7 @@ module Docs
     HTML
 
     version '6' do
-      self.release = '6.3.0'
+      self.release = '6.4.0'
       self.base_url = "https://octave.org/doc/v#{self.release}/"
     end