Update custom resources and target mode docs

[IanMadd]

Description

Update custom resources and Target Mode docs.

Definition of Done

Issues Resolved

• CHEF-16130
• CHEF-16129

Related PRs

Check List

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

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[sonarqubecloud[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

[sonarqubecloud[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 SonarQube Cloud