ref(Capacitor): Add migration guide to V4

[lucas-zimerman]

DESCRIBE YOUR PR

Tell us what you're changing and why. If your PR resolves an issue, please link it so it closes automatically.

We will drop support to session replay on V4, this PR mainly covers the removal of session replay once users migrate to version 4 of Sentry Capacitor.

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:
• 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

Close #17236

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Project	Deployment	Actions	Updated (UTC)
sentry-docs	Ready	Preview, Comment	Apr 2, 2026 2:13pm

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Project	Deployment	Actions	Updated (UTC)
develop-docs	Ignored		Apr 2, 2026 2:13pm