Update php-agent-compatibility-requirements.mdx for Yii2

[razvanphp]

This is related to and should be merged after this MR: https://github.com/newrelic/newrelic-php-agent/pull/823

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[rhetoric101]

Here's an update from the PHP team: "This is a community member that offered his help in adding support for Yii2 framework to PHP Agent. They submitted PR with code changes. However, it’ll take some time before their work can be accepted."

The PHP team will keep track of the two related PRs and let the docs team know when it's time for a review.

[CLAassistant]

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[razvanphp]

Hey, this should be merged now, as the functionality was released withing the PHP agent. Thanks!