docs(android): Explain timezone Calendar fallback

Document why Android 13+ locales with Unicode timezone extensions keep using Calendar while normal locales use the default timezone directly for performance.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: adinauer

sentry-android-core/src/main/java/io/sentry/android/core/DeviceInfoUtil.java

@@ -257,6 +257,9 @@ private void setDeviceIO(
   @SuppressWarnings("NewApi")
   @NotNull
   private TimeZone getTimeZone() {
+    // Only use the costly Calendar API on Android 13+ (API Level 33+) when the locale contains a
+    // Unicode timezone extension (for example "en-US-u-tz-usnyc"), because Calendar honors that
+    // extension. For all other cases, use the process default timezone directly for performance.
     if (buildInfoProvider.getSdkInfoVersion() >= Build.VERSION_CODES.TIRAMISU) {
       LocaleList locales = context.getResources().getConfiguration().getLocales();
       if (!locales.isEmpty()) {