Update lib/rails/app_env/credentials.rb

Co-authored-by: Copilot <[email protected]>

Author: tangrufus

lib/rails/app_env/credentials.rb

@@ -9,7 +9,7 @@ class << self
         attr_reader :original
 
         def initialize!
-          raise AlreadyInitializedError.new "Rails::AppEnv::Credentials has been already initialized." if @initialized
+          raise AlreadyInitializedError.new "Rails::AppEnv::Credentials has already been initialized." if @initialized
           @initialized = true
 
           @original = Rails.application.config.credentials