[RS-2108] Clarify DPI alerts are in alerts page

[gantony]

This PR updates the docs to reference that DPI alerts are shown in the alerts page. This was wrong in the 3.19 version, and was planned for 3.20 EP2, but that change is no longer happening.

Product Version(s):

Issue:
https://tigera.atlassian.net/browse/RS-2108

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SME review:

• An SME has approved this change.

DOCS review:

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

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• Build completed successfully
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[ctauchen]

LGTM, pending clean build. Are you ready for a merge? @gantony

[gantony]

LGTM, pending clean build. Are you ready for a merge? @gantony

Yes, I have no more changes to add. Please feel free to merge whenever you can.