bump Zeitwerk to 2.2

Gemfile.lock

@@ -71,7 +71,7 @@ PATH
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-      zeitwerk (~> 2.1, >= 2.1.8)
+      zeitwerk (~> 2.2)
     rails (6.0.0)
       actioncable (= 6.0.0)
       actionmailbox (= 6.0.0)
@@ -529,7 +529,7 @@ GEM
     websocket-extensions (0.1.3)
     xpath (3.2.0)
       nokogiri (~> 1.8)
-    zeitwerk (2.1.9)
+    zeitwerk (2.2.0)
 
 PLATFORMS
   java

activesupport/activesupport.gemspec

@@ -34,5 +34,5 @@
   s.add_dependency "tzinfo",          "~> 1.1"
   s.add_dependency "minitest",        "~> 5.1"
   s.add_dependency "concurrent-ruby", "~> 1.0", ">= 1.0.2"
-  s.add_dependency "zeitwerk",        "~> 2.1", ">= 2.1.8"
+  s.add_dependency "zeitwerk",        "~> 2.2"
 end

guides/source/autoloading_and_reloading_constants.md

@@ -300,18 +300,13 @@ As you see, that still uses `String#camelize` as fallback. If you instead prefer
 
 ```ruby
 # config/initializers/zeitwerk.rb
-inflector = Class.new(Zeitwerk::Inflector) do
-  def camelize(basename, _abspath)
-    basename == "html_parser" ? "HTMLParser" : super
-  end
-end.new
-
 Rails.autoloaders.each do |autoloader|
-  autoloader.inflector = inflector
+  autoloader.inflector = Zeitwerk::Inflector.new
+  autoloader.inflector.inflect("html_parser" => "HTMLParser")
 end
 ```
 
-Please, check the [Zeitwerk documentation](https://github.com/fxn/zeitwerk#custom-inflector) for further details.
+You can even define a custom inflector for full flexibility. Please, check the [Zeitwerk documentation](https://github.com/fxn/zeitwerk#custom-inflector) for further details.
 
 Troubleshooting
 ---------------