Fix examples/textures/textures_image_rotate.c help instructions (#3286)

examples/textures/textures_image_rotate.c

@@ -64,6 +64,8 @@ int main(void)
 
             DrawTexture(textures[currentTexture], screenWidth/2 - textures[currentTexture].width/2, screenHeight/2 - textures[currentTexture].height/2, WHITE);
 
+            DrawText("Press LEFT MOUSE BUTTON to rotate the image clockwise", 250, 420, 10, DARKGRAY);
+
         EndDrawing();
         //----------------------------------------------------------------------------------
     }
@@ -76,4 +78,4 @@ int main(void)
     //--------------------------------------------------------------------------------------
 
     return 0;
-}
+}