[material-ui][docs] Add docs for complementary stepper components

[anle9650]

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

Part of #39952. Fixes #41454.

[DiegoAndai]

@michaldudak, would you know the reason for this failure?

[michaldudak]

No idea. It seems that only this PR is affected. We could try recreating the PR.

[anle9650]

We could try recreating the PR.

I tried creating a new branch from upstream/next in #41993, but ran into the same problem 🤔

[michaldudak]

Since this PR touches just the docs, it's safe to bypass the checks and merge it.

[DiegoAndai]

Hey @anle9650, thanks for working on this. The changes look good to me, but I want to wait for @samuelsycamore's review in case there's anything to add or rephrase.

[anle9650]

Thank you for the suggestions @samuelsycamore !

[mui-bot]

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