v6.8: enhance writing while fixing grammar and punctuation mistakes (#53)
* enhance writing while fixing grammar and punctuation mistakes * Update rails6/en/chapter02-api.adoc Co-authored-by: Alexandre Rousseau <[email protected]> * Update rails6/en/chapter02-api.adoc Co-authored-by: Alexandre Rousseau <[email protected]> * Update rails6/en/chapter02-api.adoc Co-authored-by: Alexandre Rousseau <[email protected]> Co-authored-by: Alexandre Rousseau <[email protected]>