Fix example & spell check in content

[MM25Zamanian]

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[arthurevans]

The example changes don't look correct. It looks like you're updating one line to using Rollup 3 style but not the others. All the other examples here use Rollup 3 style, so we should leave that in place until we update.

If you want to narrow this to just fixing the typos in "regenerator" and "components", I'll take it (webcomponents is fine as one word, matching the polyfill name, or web components as two words with no hyphen).

[arthurevans]

As noted above, narrow to type fixes.