Update PyTorch documentation (1.8.0)

Author: simon04

lib/docs/scrapers/pytorch.rb

@@ -21,7 +21,7 @@ class Pytorch < UrlScraper
     HTML
 
     version do
-      self.release = '1.7.0'
+      self.release = '1.8.0'
       self.base_url = "https://pytorch.org/docs/#{release}/"
     end