Update faq-build.md

[wlwl2]

Added more notes on JSX comments in reactjs.

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[alexkrolick]

Hello, {name} should not be in the comment block

[wlwl2]

Hello, {name} should not be in the comment block

Purpose was to show that you could do that. Am I missing something here?

[alexkrolick]

You can demonstrate multiline comments without commenting out the code itself:

<div>
  {/* It also works 
  for multi-line comments. */}
  Hello, {name}!
</div>

[wlwl2]

@alexkrolick Alright, I made the change.