Add JSON & YAML examples in "Relevant OSCAL Concepts" section

[Rene2mt]

This is a ...

improvement - something could be better

This relates to ...

• the FedRAMP OSCAL baselines
• the FedRAMP SSP OSCAL Example
• the FedRAMP SAP OSCAL Example
• the FedRAMP SAR OSCAL Example
• the FedRAMP POA&M OSCAL Example
• the FedRAMP OSCAL Validations
• the Not sure

User Story

See user story issue #1136

Goals

This sub-issue is specifically about adding the JSON & YAML examples in the "Relevant OSCAL Concepts" section and sub-sections of the documentation:

• Review and updated any files in /documentation/general-concepts/ that currently only have XML examples

Dependencies

No response

Acceptance Criteria

• All FedRAMP Documents Related to OSCAL Adoption (https://github.com/GSA/fedramp-automation) affected by the changes in this issue have been updated.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.

Other information

No response