[doc] Outdated Entry in Hash

[Castone22]

rbs/stdlib/builtin/hash.rbs

Lines 52 to 61 in 418f74d

	# Hashes are also commonly used as a way to have named parameters in functions.
	# Note that no brackets are used below. If a hash is the last argument on a
	# method call, no braces are needed, thus creating a really clean interface:
	#
	# Person.create(name: "John Doe", age: 27)
	#
	# def self.create(params)
	# @name = params[:name]
	# @age = params[:age]
	# end

Doc entry at the linked line isn't compliant with ruby 2.7 anymore... I'm not really sure what the best way to present the alternative would be.