[docs] Describe slotProps in MUI Base customization doc

[michaldudak]

The MUI Base Customization doc doesn't mention slotProps. I added a section about it and another section at the bottom that helps choosing the customization option.

[mui-bot]

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• docs/data/base/getting-started/customization/customization.md

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[michaldudak]

Thanks for the review guys. @samuelsycamore, what's your opinion on #36206 (comment)? I feel like describing all the options first and then providing guidance for the most popular styling solutions would read better especially if someone uses a styling solution that's not covered here.

[mj12albert]

I feel like describing all the options first and then providing guidance for the most popular styling solutions would read better especially if someone uses a styling solution that's not covered here.

Let me add that the reasoning for my suggestion is that as a reader, "what option should I choose?" was the top question on my mind after reading "...several methods of customization..." in the introduction

[michaldudak]

All right, I moved this section to the top and reorganized the headers. Let me know what you think.

[samuelsycamore]

Looks great! 🙌

[siriwatknp]

@michaldudak I have fixed the docs:api in #36743. I will merge this one after that.

[michaldudak]

OK, thanks a lot!