ref(Capacitor): Update migration guide (#13909)

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This PR adds a mention on the drop support for Capacitor 5 and older,
also mentions the new required self-hosted version in order to use the
new SDK.

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---------

Co-authored-by: Krystof Woldrich <[email protected]>

Author: lucas-zimerman

docs/platforms/javascript/guides/capacitor/migration/v1-to-v2/index.mdx

@@ -14,6 +14,13 @@ Version 2 of the SDK is compatible with Sentry self-hosted versions 24.4.2 or hi
 
 In preparation for v2 of the OpenTelemetry SDK, the minimum required TypeScript version is increased to version `5.0.4`.
 
+### Dropping Support for Capacitor 5 and Earlier
+
+To ensure the best experience with the latest Capacitor features, support for Capacitor 5 and earlier will be discontinued starting with version 2.0. We recommend upgrading to Capacitor 6 or later. If you need to continue using older Capacitor versions, please stick with Sentry Capacitor SDK v1.
+
+### Self-Hosted Sentry Compatibility
+
+Beginning with version 2.0.0, the Sentry Capacitor SDK will only support self-hosted Sentry instances version 25.2.0 and above. This change does not affect users of `sentry.io`.
 
 ## How to upgrade to SDK version 2: