[PL-57304]: update aws hostname in docs

[GokulBansal0]

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Description

• Please describe your changes: update aws hostname in docs
• Jira/GitHub Issue numbers (if any): PL-57304
• Preview links/images (Internal contributors only): __________________

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[dewan-ahmed]

When the user wants to browse the public registry, visiting https://public.ecr.aws/harness results in

{"errors":[{"code":"DENIED","message":"Not Authorized"}]}

but https://gallery.ecr.aws/ works.
For this statement, "You can find Harness CI images on Harness ECR public...", I believe we can keep https://gallery.ecr.aws/ since https://public.ecr.aws/ redirects to https://gallery.ecr.aws/
For docs on the registry URL "To pull Harness images from ECR ... then enter https://public.ecr.aws/harness for Docker Registry URL." we can s/gallery/public.

Waiting on Jeremy's response on the above.

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