correct the wrong spelling 'ArduinoBiding' with the lost 'n'
refine
refine
refine the subtitle indices in Chapter 1.1.2
refine Chapter 1.2.2
make the Chapter 1.1.1 more smooth
make the Chapter 1.1.2 more smooth
make the Chapter 1.1.2 more smooth
make Chapter 1.1.3 more smooth
make Chapter 2.2 more smooth
make Chapter 2.2.3 more like a paragraph from a piece of paper