WIP: Add Documentation for Selective Override

[mikegcoleman]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind content

Any specific area of the project related to this PR?

/area documentation

What this PR does / why we need it:

This PR modifies the existing section on extending rules to include the new selective override feature.

Which issue(s) this PR fixes:

Fixes #1226

Special notes for your reviewer:

[poiana]

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[poiana]

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• 03e7d7d Fixed typo

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[mikegcoleman]

This is the wrong commit - closing.