add doc for public apis

[shao-sran]

Description

add documents for IoT public apis
/pub/v4.0/network/securityRules
/pub/v4.0/network/purgeRules
/pub/v4.0/thirdPartyScan
/pub/v4.0/xsoar/status
/pub/v4.0/xsoar/device/scanDetails
/pub/v4.0/xsoar/heartbeat

Motivation and Context

Requested by QA team

How Has This Been Tested?

test on local build

Screenshots (if appropriate)

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• [x ] I have updated the documentation accordingly.
• [ x] I have read the CONTRIBUTING document.
• [ x] I have added tests to cover my changes if appropriate.
• [ x] All new and existing tests passed.

[github-actions]

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