Fix typos and add alt text for example chapter09_08

Author: Alejandro-Casanova

examples/chapter09_08/readme.md

@@ -1,4 +1,5 @@
 # Example Chapter09_08
+
 ## Controlling an RGB LED
 
 Example chapter09_08 utilizes object oriented programming techniques
@@ -14,7 +15,7 @@ an underlying tick derived from a timer interrupt that
 runs every $50~{\mu}\text{s}$.
 
 In this example (as in most other examples), both a hardware
-version for the target system as well as a simlulated PC
+version for the target system as well as a simulated PC
 version are available. For this exercise, it was
 decided to implement a rather detailed PC simulation
 using old-school traditional Win32-API programming.
@@ -30,4 +31,4 @@ The user LED is simultaneously toggled at the usual $\frac{1}{2}~\text{Hz}$.
 The chapter09_08 Win32-API simulation in its Windows-based
 application is shown in action in the image below.
 
-![](./images/rgb_led_wnd_09_08.jpg)
+![Capture of Win32-API simulation](./images/rgb_led_wnd_09_08.jpg)