Update Erlang documentation (25.2.2)

Fixes #1900.

lib/docs/filters/erlang/clean_html.rb

@@ -2,11 +2,12 @@ module Docs
   class Erlang
     class CleanHtmlFilter < Filter
       def call
-        @doc = at_css('#content .innertube', '#content')
+        @doc = at_css('#content .innertube:only-child', '#content')
 
         # frontpage
 
         css('center:last-child').remove # copyright
+        css('.footer').remove # copyright
 
         css('center', '.example').each do |node|
           node.before(node.children).remove

lib/docs/scrapers/erlang.rb

@@ -36,12 +36,12 @@ module Docs
     ]
 
     options[:attribution] = <<-HTML
-      &copy; 2010&ndash;2022 Ericsson AB<br>
+      &copy; 2010&ndash;2023 Ericsson AB<br>
       Licensed under the Apache License, Version 2.0.
     HTML
 
     version '25' do
-      self.release = '25.1'
+      self.release = '25.2.2'
     end
 
     version '24' do