[moduleResolution bundler] List restrictions from initial PR in documentation

[Ayc0]

In the v5.0, when the mode bundler was introduced, in the PR's description (see microsoft/TypeScript#51669), there was a list of restrictions:

Module syntax restrictions

--moduleResolution bundler does not support resolution of require calls. In TypeScript files, this means the import mod = require("foo") syntax is forbidden; in JavaScript files, require calls are not errors but only ever return the type any (or whatever an ambient declaration of a global require function is declared to return).

But those restrictions aren't listed in the doc:

I added those back to the main documentation.

Maybe this isn't the best place for it, and maybe it should live in the cookbook.

This is my 1st contribution to this repo so Idk if I followed every guideline.

[Ayc0]

@microsoft-github-policy-service agree

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[andrewbranch]

Thanks @Ayc0!