FAQ: Add an explainer for certain output

Location: https://github.com/babel/website/blob/master/docs/faq.md

Example: `(0, _pirates.addHook)(...)` - we want to call with the right context

https://stackoverflow.com/questions/32275135/why-does-babel-rewrite-imported-function-call-to-0-fn, etc

Open docs/faq.md and review the linked Stack Overflow question about Babel rewriting an imported function call to `(0, _pirates.addHook)(...)`. Clarify why this output is produced and how it relates to calling the function with the correct context. Done means the FAQ contains a self-contained explainer for this output.

Written by the indexing model from the issue text.