Update types-exists.asciidoc

[dodysw2]

fix inconsistency in example request

• Have you signed the contributor license agreement? Yes
• Have you followed the contributor guidelines? Yes
• If submitting code, have you built your formula locally prior to submission with gradle check?
• If submitting code, is your pull request against master? Unless there is a good reason otherwise, we prefer pull requests against master and will backport as needed.
• If submitting code, have you checked that your submission is for an OS and architecture that we support?
• If you are submitting this code for a class then read our policy for that.

[elasticmachine]

Pinging @elastic/es-docs (Team:Docs)

[jrodewig]

LGTM. Thanks for the correction @dodysw2.

[jrodewig]

@elasticmachine test this please