Document that process needs to be polyfilled with Webpack 5 due to util transitive dependency

[tylerbutler]

Oh, I see now in a comment later:

We do however transitively depend on the util npm package (node_modules/util/util.js) which requires process.env to be defined. browserify/node-util#57 (comment)

I'll file an issue if you haven't already. At the very least this will need to be documented when using our packages with Webpack 5.

Originally posted by @tylerbutler in #10186 (comment)

[ghost]

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