Clarify skip function signature in README

[eiriksm]

Howdy. Thanks for this module!

I guess this PR is kind of a matter of taste, but as I read the documentation I felt that the way the function signature was described was kind of odd. So here is a PR that makes it look more like I would expect it to. It has these pros (as I see it)

• It is now possible to actually copy paste the signature into your own code (and everyone likes to copy paste things from the internet into their codebases and terminals)
• It is easier to see that this part is actually code and not "text".

Anyway, as I said, I guess it also is somewhat a matter of taste. So if it does not fit with your taste, no offence taken :)

Thanks again for an awesome module (not to mention hapi itself). Have a great weekend!

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