Add note to updateLocale (#581)
Add note to updateLocale (#581)

* Add note to updateLocale

* Fix typo, improve comment

* Update 00-intro.md

Co-authored-by: Kunal Marwaha <b5368ff72a2a18d420f957c38ea344ec5eed3ba7@berkeley.edu>
moment/momentjs.com,moment/momentjs.com