Update documentation to indicate Freebsd12 deprecation for Infra Client

[neha-p6]

Description

Update documentation to indicate Freebsd12 deprecation for Infra Client. NOTE: Do not merge until upcoming Infra Client 18.5.x release.

Definition of Done

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or StackOverflow discussion that's relevant]

Related PRs

Check List

• [ ] Spell Check
• [ ] Local build
• [ ] Examine the local build
• [ ] All tests pass

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[neha-p6]

@IanMadd Infra client 18.5 is released, these doc changes can be made live now

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud