describe-function: show arguments before documentation string

[odanoburu]

Describe your proposed change:

Show function arguments before their documentation string.

Why do you believe this to be an improvement?

Maybe it's just a personal preference, but I find it better to know what the arguments are before reading about them. This change also makes it easier to find the arguments in case the user knows what the function does, but doesn't remember the exact arguments or their order.

Additional context/User story:
I assume the describe interface was inspired by that of Emacs, so I wonder why it deviated from it in this respect. I'm sorry if it was deliberate.

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Pre-Build Checklist:

• Discussion has occurred.
• One or more developers have signed off on this change.
• One or more user researchers have signed off on this change.

[aadcg]

I think this is a valid point.

Shouldn't be hard, perhaps you could even give it a try!