[docs] Add styles to styled argument list

[DiegoAndai]

• I have followed (at least) the PR section of the contributing guide.

Related issues:

• [docs] Add docs on composing css with styled #37397
• Better documentation about styled API #33412

The styles argument is not listed in the styled function arguments list. Adding it will help with its usage.

A few questions

• styled` can receive multiple arguments, all with the same type, should we document it? I think it would create more confusion, so my answer is no, but if you disagree please let me know
• I used ({ ...props, theme }) => object as the function signature because that's the most concise way I could come up with to explain it, but I would appreciate alternatives if you think of some
• Is there anything else that we should add to the explanation?

[mui-bot]

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[siriwatknp]

👍 Nice improvement!