Update 1.2-blink-and-read.md code formatting for RGB

docs/courses/hello-world/1.2-blink-and-read.md

@@ -86,7 +86,7 @@ print(T)
 
 **I2C (Inter-Integrated Circuit)**: I2C is a communication protocol used for connecting and exchanging data between electronic components on a circuit board or between different devices. It stands for Inter-Integrated Circuit and allows multiple digital devices to communicate with each other using a common set of wires, typically two (SDA for data and SCL for clock), making it useful for connecting sensors, displays, and other peripherals in a simple and standardized way.
 
-**RGB Color Values**: In the context of RGB color representation, 0 to 255 refers to the range of values for each of the three color channels: Red (R), Green (G), and Blue (B). Each channel can have a value between 0 (no intensity) and 255 (maximum intensity), allowing for a total of 256 different levels of intensity for each color. By combining different levels of intensity for these three channels, you can create a wide range of colors by specifying how much red, green, and blue are mixed together. For example, RGB(255, 0, 0) represents full red, RGB(0, 255, 0) represents full green, and RGB(0, 0, 255) represents full blue. Mixing these channels in different proportions produces various colors in the RGB color space.
+**RGB Color Values**: In the context of RGB color representation, 0 to 255 refers to the range of values for each of the three color channels: Red (`R`), Green (`G`), and Blue (`B`). Each channel can have a value between 0 (no intensity) and 255 (maximum intensity), allowing for a total of 256 different levels of intensity for each color. By combining different levels of intensity for these three channels, you can create a wide range of colors by specifying how much red, green, and blue are mixed together. For example, RGB(255, 0, 0) represents full red, RGB(0, 255, 0) represents full green, and RGB(0, 0, 255) represents full blue. Mixing these channels in different proportions produces various colors in the RGB color space.
 
 **Spectrophotometer**: A spectrophotometer is a scientific instrument used to measure the intensity of light at different wavelengths in a sample. It works by passing a beam of light through the sample and measuring how much light is absorbed or transmitted. Spectrophotometers are commonly used in chemistry, biology, and physics to analyze the concentration of substances in a solution, study the properties of materials, and determine the color or composition of samples by measuring their absorption or emission spectra.