feat(kmp): add SPM note in getting started (#12519)

* feat(kmp): add SPM note in getting started

* Update kotlin.kotlin-multiplatform.mdx

* Update kotlin.kotlin-multiplatform.mdx

* Update kotlin.kotlin-multiplatform.mdx

* Update platform-includes/getting-started-install/kotlin.kotlin-multiplatform.mdx

Co-authored-by: Alex Krawiec <[email protected]>

---------

Co-authored-by: Alex Krawiec <[email protected]>

Author: buenaflor

platform-includes/getting-started-install/kotlin.kotlin-multiplatform.mdx

@@ -7,3 +7,9 @@ plugins {
 ```
 
 The plugin installs the Sentry KMP dependency. If you're using the Cocoapods plugin, it will also install the Sentry Cocoa dependency.
+
+<Alert>
+
+If you use Swift Package Manager instead of Cocoapods, you need to install the [sentry-cocoa dependency with Swift Package Manager](/platforms/apple/install/swift-package-manager/) in your Xcode project first before executing the Gradle plugin. 
+
+</Alert>