Update Rust documentation (1.51.0)

Author: simon04

lib/docs/scrapers/rust.rb

@@ -3,7 +3,7 @@
 module Docs
   class Rust < UrlScraper
     self.type = 'rust'
-    self.release = '1.50.0'
+    self.release = '1.51.0'
     self.base_url = 'https://doc.rust-lang.org/'
     self.root_path = 'book/index.html'
     self.initial_paths = %w(