Update TensorFlow documentation (2.16.1)

The documentation on https://www.tensorflow.org/versions does not match
the latest release on https://github.com/tensorflow/tensorflow/releases.

See also: #2440 (comment)

Author: simon04

lib/docs/scrapers/tensorflow/tensorflow.rb

@@ -20,7 +20,7 @@ class Tensorflow < UrlScraper
     HTML
 
     version do
-      self.release = "2.18.0"
+      self.release = "2.16.1"
       self.base_url = "https://www.tensorflow.org/api_docs/python/tf"
     end
 
@@ -45,7 +45,8 @@ class Tensorflow < UrlScraper
     end
 
     def get_latest_version(opts)
-      get_latest_github_release('tensorflow', 'tensorflow', opts)
+      doc = fetch_doc(self.base_url, opts)
+      doc.title[/TensorFlow v([.\d]+)/, 1]
     end
 
     private

lib/docs/scrapers/tensorflow/tensorflow_cpp.rb

@@ -4,7 +4,7 @@ class TensorflowCpp < Tensorflow
     self.slug = 'tensorflow_cpp'
 
     version do
-      self.release = "2.18.0"
+      self.release = "2.16.1"
       self.base_url = "https://www.tensorflow.org/api_docs/cc"
     end