Sync SDL3 wiki -> header

[ci skip]

docs/README-android.md

@@ -598,7 +598,7 @@ The only caveat is that the APK's support a single architecture.
 
 When configuring the CMake project, you need to use the Android NDK CMake toolchain, and pass the Android home path through `SDL_ANDROID_HOME`.
 ```
-cmake .. -DCMAKE_TOOLCHAIN_FILE=<path/to/android.toolchain.cmake> -DANDROID_ABI=<android-abi> -DSDL_ANDROID_HOME=<path-to-android-sdk-home> -DANDROID_PLATFORM=23 -DSDL_TESTS=ON
+cmake .. -DCMAKE_TOOLCHAIN_FILE=<path/to/android.toolchain.cmake> -DANDROID_ABI=<android-abi> -DSDL_ANDROID_HOME=<path-to-android-sdk-home> -DANDROID_PLATFORM=21 -DSDL_TESTS=ON
 ```
 
 Remarks: