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Forward config from bootstrap.scss so $utilities is configurable (#42801)

* Forward config from bootstrap.scss so $utilities is configurable

`$utilities` lives in `_config.scss`, which `bootstrap.scss` never
forwarded. Every Sass example on the utilities API page therefore failed
with "This variable was not declared with !default in the @used module".
Forward config, then rewrite the examples around the two working patterns.

* Use the `as *` convention in the utilities API snippets

The `as bs` namespace appears nowhere else in the repo. The docs load
Bootstrap modules with `as *`, so these snippets now do the same. Sass
writes an assignment to an `as *` member back to the source module, so
the two-file pattern still reaches `bootstrap/scss/config`.

* Add a free key to the width example in the utilities API docs

The example said it adds a value, but key `10` already exists at
`10rem`, so the merge replaced it. Key `20` is free, and `20%` matches
the other width percentages. The example now adds `.w-20` and keeps
`.w-10`.

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