docs: add aws provider ref in install provider

[aramase]

Signed-off-by: Anish Ramasekar anish.ramasekar@gmail.com

What this PR does / why we need it:

• Add AWS provider reference in the provider install section

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #

Special notes for your reviewer:

[k8s-ci-robot]

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This pull-request has been approved by: aramase

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[tam7t]

/lgmt

[tam7t]

/lgtm