doc: document Helm parameters for GRPC enforcement of ALPN

[rhybrillou]

Document the config options to enforce application-level protocol negotiation between central and sensor.

Version(s):

4.9

Issue:

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Fri Jul 04 14:05:10 - Prow CI generated the docs preview:

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[openshift-ci]

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