fix(compose-multiplatform): remove unnecessary header (#14461)

`# Compose Multiplatform` is unnecessary since the page already displays
a header by default

Author: buenaflor

docs/platforms/kotlin/guides/compose-multiplatform/index.mdx

@@ -8,8 +8,6 @@ categories:
 sidebar_order: 15
 ---
 
-# Compose Multiplatform
-
 <Alert level="warning" title="Experimental Support">
 While Sentry's Kotlin Multiplatform SDK works in Compose Multiplatform (CMP) projects, it isn't natively supported or fully tested for CMP. Some features may behave unexpectedly or provide incomplete data. Use with caution in production environments and report any issues you encounter.
 </Alert>
@@ -56,4 +54,4 @@ For Android applications, you need to manually upload ProGuard mapping files usi
 
 ### iOS
 
-For iOS applications, follow the [Uploading Debug Symbols guide](/platforms/apple/guides/ios/dsym) to set up debug symbols upload.
+For iOS applications, follow the [Uploading Debug Symbols guide](/platforms/apple/guides/ios/dsym) to set up debug symbols upload.