Fix PHP Monolog LogsHandler constructor in logs docs

[Hashim1999164]

DESCRIBE YOUR PR

Fixes #19177

The PHP logs setup snippet still constructed LogsHandler with a Hub argument. In sentry/sentry 4.x that constructor only takes a log level (and bubble), so the sample failed as written. Updated it to match the working 4.x call.

IS YOUR CHANGE URGENT?

• Urgent deadline (GA date, etc.): YYYY-MM-DD
• Other deadline: YYYY-MM-DD
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PRE-MERGE CHECKLIST

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

Test plan

• Compared against sentry-php 4.30 LogsHandler::__construct
• Spot check https://docs.sentry.io/platforms/php/logs/ after merge

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