Rephrase architecture docs

Clemens Beckrequested to merge
cb-drop-arch-col-docs into master

What does this MR do?

Rephrase architecture docs

  • Drop confusing architecture column from K8s support matrix.
  • Rephrase arm support notice.

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  • Merge Request Title and Description are up to date, accurate, and descriptive.
  • MR targeting the appropriate branch.
  • MR has a green pipeline.
  • Documentation created/updated.
  • Tests added/updated, and test plan for scenarios not covered by automated tests.
  • Equivalent MR/issue for omnibus-gitlab opened.

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