📖 Update controller-gen CLI documentation for better info regards paths argument

[padlar]

Description

Add paths description on how to specify multiple paths.

Motivation

<TODO: Would be nice add here the problem faced and from where you got the info to update this one>

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: padlar / name: Sunil Shivanand (755906c7846df8dc1bd28fc7b26c90ff5041b9ab)

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[k8s-ci-robot]

Hi @padlar. Thanks for your PR.

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[camilamacedo86]

/ok-to-test

[FillZpp]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: camilamacedo86, padlar

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