Amend formula class name to Gerrit

Change-Id: I351c07598aa46b6c728add07affb7490f29b1911
diff --git a/gerrit.rb b/gerrit.rb
index 14aea47..407bf0a 100644
--- a/gerrit.rb
+++ b/gerrit.rb
@@ -1,7 +1,7 @@
 # typed: false
 # frozen_string_literal: true
 
-class Blocksite < Formula
+class Gerrit < Formula
   desc ""
   homepage "https://www.gerritcodereview.com"
   version "3.11.0-rc0"