docs: align PHP SDK documentation

[jonathannorris]

Summary

• Correct PHP runtime and extension requirements.
• Clarify SDK Proxy usage, fix Composer examples, and correct the user model link.

Validation

• git diff --check passed

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[Copilot]

Pull request overview

Aligns the PHP Server SDK documentation with the current SDK behavior and packaging, reducing ambiguity around bucketing mode usage and ensuring install/usage instructions match the latest SDK expectations.

Changes:

• Clarifies Cloud Bucketing vs SDK Proxy positioning in the PHP SDK overview.
• Updates runtime/installation guidance (PHP version + extensions) and Composer dependency examples.
• Fixes references and examples (user model link, constructor options snippet).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/sdk/server-side-sdks/php/php.md	Updates the SDK overview text to emphasize Cloud Bucketing and point local-style bucketing to SDK Proxy.
docs/sdk/server-side-sdks/php/php-usage.md	Corrects the link to the current PHP user model class.
docs/sdk/server-side-sdks/php/php-openfeature.md	Pins Composer dependency example to a specific compatible major/minor range.
docs/sdk/server-side-sdks/php/php-install.md	Updates PHP/runtime prerequisites and aligns Composer dependency example.
docs/sdk/server-side-sdks/php/php-gettingstarted.md	Fixes the DevCycleClient initialization options example syntax.

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