fix formatting and update outline

Fixed some text that was included in code-block, increased outline depth to 2 for better navigation.
diff --git a/docs/tutorials/os_fundamentals/tasks_lesson.rst b/docs/tutorials/os_fundamentals/tasks_lesson.rst
index 4773cdc..f552353 100644
--- a/docs/tutorials/os_fundamentals/tasks_lesson.rst
+++ b/docs/tutorials/os_fundamentals/tasks_lesson.rst
@@ -11,7 +11,7 @@
 
 .. contents::
    :local:
-   :depth: 1
+   :depth: 2
 
 Prerequisites
 -------------
@@ -279,14 +279,14 @@
        }
    }
 
- In order to notice the LED changing, modify the time delay in
+In order to notice the LED changing, modify the time delay in
 ``main()`` to blink at a higher frequency.
 
 .. code-block:: c
 
    os_time_delay(OS_TICKS_PER_SEC/10);
 
- Before we run the app, let’s predict the behavior. With the newest
+Before we run the app, let’s predict the behavior. With the newest
 additions to ``work_task_handler()``, our first action will be to sleep
 for three seconds. This allows the ``main`` task, running ``main()``, to
 take over the CPU and blink to its heart’s content. After three seconds,