Reduce LaTeX complexity

Author: ckormanyos

examples/chapter09_08b/readme.md

@@ -13,11 +13,10 @@ the commercially-available, open-platform
 [STM32F100 Value Line Discovery Kit](https://www.st.com/en/evaluation-tools/stm32vldiscovery.html)
 with soldered-on pins fitted on a breadboard.
 
-The wiring is straightforward. The blinking LED at $\frac{1}{2}~\text{Hz}$
-uses the blue colored user-LED controlled by pin `portc.8`.
+The wiring is straightforward. The standard monotone blinking LED
+uses the blue user-LED factory-fitted on pin `portc.8`.
 The RGB LED digital control signal is on `portb.9`.
-A logic-AND gate shifts the microcontroller pin's level
-from $3.3~\text{V}$ to $5~\text{V}$.
+A logic-AND gate shifts the microcontroller pin's voltage level.
 The microcontroller is clocked at $24~\text{MHz}$.
 
 The hardware setup with the RGB LED in action is pictured