[RS-2338] Update WAF docs following changes to configmap name and format

[gantony]

Product Version(s):
3.21 EP2 (so master only for now)

Issue:
https://tigera.atlassian.net/browse/RS-2338

Link to docs preview:

SME review:

• An SME has approved this change.

DOCS review:

• A member of the docs team has approved this change.

Additional information:

Merge checklist:

• Deploy preview inspected wherever changes were made
• Build completed successfully
• Test have passed

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