Invalid example json fix

[stsatlantis]

Description

Example under radios and radiobuttons had invalid json. I fixed it.

@json-schema-form/angular-schema-form-lead

Checklist

• [x] I have read and understand the CONTRIBUTIONS.md file
• [x] I have searched for and linked related issues
• [ ] I have created test cases to ensure quick resolution of the PR is easier
• [ ] I am NOT targeting main branch
• [x] I did NOT include the dist folder in my PR

The remaining 2 elements on the checklist is unnecessary, because It's in an md file.

[Anthropic]

@stsatlantis thanks for that, love doc update PRs, appreciate your time :) I have applied the change to development branch, so I will close this PR.