Avoid rubocop directive ending up in YARD docs

It turns out that YARD displays a special section "Dynamic Method
Handling" for classes that implement `method_missing` even though this
method is tagged as private. The rubocop directive was getting caught up
in the YARD docs.

lib/mocha/mock.rb

@@ -309,12 +309,10 @@ def all_expectations
  end
 
  # @private
- # rubocop:disable Style/MethodMissingSuper
- def method_missing(symbol, *arguments, &block)
+ def method_missing(symbol, *arguments, &block) # rubocop:disable Style/MethodMissingSuper
  handle_method_call(symbol, arguments, block)
  end
  ruby2_keywords(:method_missing)
- # rubocop:enable Style/MethodMissingSuper
 
  # @private
  def handle_method_call(symbol, arguments, block)