Add lint to the API repo

[craigbox]

If you introduce curly unicode quotes (““ instead of ""), you will eventually break the linter on istio.io.

For example #3426

// For text format, the output of the empty operator is changed from “-“ to an empty string.

leads to istio/istio.io#16281 (prow)

./content/en/docs/reference/config/istio.mesh.v1alpha1/index.html:1707:For text format, the output of the empty operator is changed from “-“ to an empty string.
Ensure content only uses standard quotation marks and not “

Could we please introduce some light linting to PRs here for this use case, which has now happened at least enough times that i remember it?