docs: Lower minSdk version to 21

docs/docs/guides/TROUBLESHOOTING.mdx

@@ -82,12 +82,12 @@ If you're experiencing build issues or runtime issues in VisionCamera, make sure
    yarn   # or `npm i`
    ```
 4. Make sure you have installed the [Android NDK](https://developer.android.com/ndk).
-5. Make sure your minimum SDK version is **26 or higher**, and target SDK version is **33 or higher**. See [the example's `build.gradle`](https://github.com/mrousavy/react-native-vision-camera/blob/main/package/example/android/build.gradle#L5-L9) for reference.
+5. Make sure your minimum SDK version is **21 or higher**, and target SDK version is **33 or higher**. See [the example's `build.gradle`](https://github.com/mrousavy/react-native-vision-camera/blob/main/package/example/android/build.gradle#L5-L9) for reference.
    1. Open your `build.gradle`
    2. Set `buildToolsVersion` to `33.0.0` or higher
    3. Set `compileSdkVersion` to `33` or higher
    4. Set `targetSdkVersion` to `33` or higher
-   5. Set `minSdkVersion` to `26` or higher
+   5. Set `minSdkVersion` to `21` or higher
    6. Set `ndkVersion` to `"23.1.7779620"` or higher
    7. Update the Gradle Build-Tools version to `7.3.1` or higher:
       ```groovy