Add note+link about multiple APM tools to platforms page

[kahest]

DESCRIBE YOUR PR

We want to improve the information we provide on what possible side-effects are when using multiple APM tools in parallel. We have a support article about this topic that's currently being reworked.

Once this is updated, this PR should be merged to call out the article on the platforms page.

IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs to go live.

• Urgent deadline (GA date, etc.):
• Other deadline: after support article is updated, likely before ~Nov 12, 2024
• None: Not urgent, can wait up to 1 week+

SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• 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

EXTRA RESOURCES

• Sentry Docs contributor guide

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[romtsn]

The support article was updating, merging this in