Fix minor typo in ActiveSupport::ProxyObject deprecation logs (rails#51688)

Author: joshuay03

activesupport/CHANGELOG.md

@@ -13,7 +13,7 @@
 
     *heka1024*
 
-*   Deprecate `ActiveSupport::ProxyObject` in favor of Ruby's buildin `BasicObject`
+*   Deprecate `ActiveSupport::ProxyObject` in favor of Ruby's built-in `BasicObject`
 
     *Earlopain*
 

activesupport/lib/active_support/proxy_object.rb

@@ -13,7 +13,7 @@ def raise(*args)
     def self.inherited(_subclass)
       ::ActiveSupport.deprecator.warn(<<~MSG)
         ActiveSupport::ProxyObject is deprecated and will be removed in Rails 7.3.
-        Use Ruby's buildin BasicObject instead.
+        Use Ruby's built-in BasicObject instead.
       MSG
     end
   end