Update content-api.yaml

[dipiash]

What does it do?

Fixed typo in documentation

Why is it needed?

Solve the error when test in Swagger:

curl -X 'POST' \
  'http://localhost:1337/api/auth/local' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "identier": "username@email.com",
  "password": "password"
}'

How to test it?

Make test request in Swagger

Related issue(s)/PR(s)

#13911

[strapi-cla]

All committers have signed the CLA.

[alexandrebodin]

Thanks for the fix :)