Add compatibility note for java php ruby boto aws sdks

[smellercf]

Summary

Initially removed compatibility notes for all AWS SDK clients but reinstated them for clients with incompatible versions with R2, as not all clients are supported.

Screenshots (optional)

Ruby

Php

Boto3

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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