docs(es): May 1 - 10

[mrcego]

Pending issues:

• Update composition-api-faq.md vuejs/docs#2338
• Changed recommendation for testing library vuejs/docs#2306
• feat: forms.md added docs references in tip note vuejs/docs#2308
• add missing anchor vuejs/docs#2349
• vuejs@961fffd
• vuejs@cb28e00
• vuejs@fc10afd
• vuejs@615cb39