Update image tag to multi-arch images

[RealHarshThakur]

Signed-off-by: Harsh Thakur harsh@civo.com

Description of your changes

Fixes documentation

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

[andyjeffries]

LGTM