Improved `KeyError` messages on bang version, since commit...

Improved `KeyError` messages on bang version, since commit https://github.com/rails/rails/commit/e768c519fb6015e00961702a5165c6dab548a954 bang version produces `KeyError` [ci skip]

activesupport/lib/active_support/ordered_options.rb

@@ -20,7 +20,7 @@ module ActiveSupport
   # To raise an exception when the value is blank, append a
   # bang to the key name, like:
   #
-  #   h.dog! # => raises KeyError
+  #   h.dog! # => raises KeyError: key not found: :dog
   #
   class OrderedOptions < Hash
     alias_method :_get, :[] # preserve the original #[] method

guides/source/security.md

@@ -1048,7 +1048,7 @@ If you want an exception to be raised when some key is blank, use the bang
 version:
 
 ```ruby
-Rails.application.secrets.some_api_key! # => raises KeyError
+Rails.application.secrets.some_api_key! # => raises KeyError: key not found: :some_api_key
 ```
 
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