ebiten: update comments

We need more insights about launch modes.

cmd/ebitenmobile/_files/EbitenSurfaceView.java

@@ -29,13 +29,12 @@ import {{.JavaPkg}}.ebitenmobileview.Renderer;
 import {{.JavaPkg}}.{{.PrefixLower}}.EbitenView;
 
 class EbitenSurfaceView extends GLSurfaceView implements Renderer {
+    // As GLSurfaceView can be recreated, the states must be static (#3097).
+    static private boolean errored_ = false;
+    static private boolean onceSurfaceCreated_ = false;
+    static private boolean contextLost_ = false;
 
     private class EbitenRenderer implements GLSurfaceView.Renderer {
-
-        private boolean errored_ = false;
-        private boolean onceSurfaceCreated_ = false;
-        private boolean contextLost_ = false;
-
         @Override
         public void onDrawFrame(GL10 gl) {
             if (errored_) {
@@ -107,7 +106,7 @@ class EbitenSurfaceView extends GLSurfaceView implements Renderer {
     }
 
     private void onContextLost() {
-        Log.v("Go", "Kill the application due to a context lost");
+        Log.e("Go", "The application was killed due to context loss");
         // TODO: Relaunch this application for better UX (#805).
         Runtime.getRuntime().exit(0);
     }

run.go

@@ -314,9 +314,6 @@ type RunGameOptions struct {
 	// When StrictContextRestration is false, Ebitengine does nothing special to restore the context and
 	// relies on the OS's behavior.
 	//
-	// As a side note, especially when StrictContextRestration is false, the activity's launch mode should
-	// be singleInstance, or the activity no longer works correctly after the context is lost.
-	//
 	// The default (zero) value is false.
 	StrictContextRestration bool
 }