[TRACING-3899] Document permissions to generate automatically the permissions for the processors

[iblancasa]

Version(s): 4.12 +

Issue: TRACING-3899

Link to docs preview: https://72917--ocpdocs-pr.netlify.app/

QE review:

• [x] QE has approved this change.

[iblancasa]

@max-cx @IshwarKanse

[ocpdocs-previewbot]

🤖 Fri Mar 22 18:36:10 - Prow CI generated the docs preview: https://72917--ocpdocs-pr.netlify.app

[openshift-ci[bot]]

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[max-cx]

@iblancasa, you're welcome to close this PR because I opened https://github.com/openshift/openshift-docs/pull/75067.