Update TensorFlow documentation (2.9.1)

Fixes #1656.

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -868,7 +868,7 @@ credits = [
     'http://tcl.tk/software/tcltk/license.html'
   ], [
     'TensorFlow',
-    '2020 The TensorFlow Authors',
+    '2022 The TensorFlow Authors',
     'CC BY',
     'https://creativecommons.org/licenses/by/4.0/'
   ], [

lib/docs/filters/tensorflow/clean_html.rb

@@ -5,6 +5,7 @@ module Docs
         @doc = at_css('.devsite-article')
 
         css('hr', '.devsite-nav', '.devsite-content-footer', '.devsite-article-body > br', '.devsite-article-meta', 'devsite-nav-buttons', '.devsite-banner', '.tfo-api img', '.tfo-notebook-buttons img', '.tfo-notebook-buttons>:first-child').remove
+        css('devsite-bookmark').remove
 
         css('aside.note').each do |node|
           node.name = 'blockquote'

lib/docs/scrapers/tensorflow/tensorflow.rb

@@ -14,11 +14,16 @@ module Docs
     options[:container] = '.devsite-main-content'
 
     options[:attribution] = <<-HTML
-      &copy; 2020 The TensorFlow Authors. All rights reserved.<br>
+      &copy; 2022 The TensorFlow Authors. All rights reserved.<br>
       Licensed under the Creative Commons Attribution License 4.0.<br>
       Code samples licensed under the Apache 2.0 License.
     HTML
 
+    version '2.9' do
+      self.release = "2.9.1"
+      self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/python/tf"
+    end
+
     version '2.4' do
       self.release = "#{version}.0"
       self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/python/tf"

lib/docs/scrapers/tensorflow/tensorflow_cpp.rb

@@ -3,6 +3,11 @@ module Docs
     self.name = 'TensorFlow C++'
     self.slug = 'tensorflow_cpp'
 
+    version '2.9' do
+      self.release = "2.9.1"
+      self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/cc"
+    end
+
     version '2.4' do
       self.release = "#{version}.0"
       self.base_url = "https://www.tensorflow.org/versions/r#{version}/api_docs/cc"