Add Rails 7.2 docs

Author: larouxn

lib/docs/scrapers/rdoc/rails.rb

@@ -75,6 +75,10 @@ class Rails < Rdoc
       end
     end
 
+    version '7.2' do
+      self.release = '7.2.0'
+    end
+
     version '7.1' do
       self.release = '7.1.2'
     end