Remove --single-quote from prettier examples

[brlewis]

Passing options directly to the cli is not great practice, since default editor integrations won't pick it up and many people are just going to copy paste this snippet. This change removes that customization and prettier will use its very sane defaults.

Closes #7615

[facebook-github-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign up at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need the corporate CLA signed.

If you have received this in error or have any questions, please contact us at [email protected]. Thanks!

[brlewis]

There's no original creative work in this PR. Everything is copied verbatim from #7646 including the commit message. EDIT: I see from the CLA that I'm required to say "Submitted on behalf of a third-party: @heyimalex "

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign up at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need the corporate CLA signed.

If you have received this in error or have any questions, please contact us at [email protected]. Thanks!

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[ianschmitz]

Thanks!