Update specs for it parameter in proc for Ruby 4.0

[herwinw]

The behaviour has changed in Ruby 4.0.
As a bonus: fix a typo: paramater => parameter

[herwinw]

This was a change written before 4.0 ( #1224), it had to be updated or it will break the specs with Ruby 4.0.

[eregon]

Ah yes I noticed the same in

spec/language/it_parameter_spec.rb

Lines 47 to 52 in 422b902

	ruby_version_is ""..."4.0" do
	proc { it }.parameters.should == [[:opt, nil]]
	end
	ruby_version_is "4.0" do
	proc { it }.parameters.should == [[:opt]]
	end

It's actually duplicated specs, not sure which one(s) we should keep but anyway let's merge this.