Answer:
In the keyboard manual
Explanation:
A manual is the document that is provided along with the devices or machines to learn about different functionalities and operations. As different model of devices and machines have different operations and functions, that may have different manuals.
Laptop have different brands and all brands have some different keyboard functionalities so they provide their users manuals for their device. We can turn off or on the key board light by reading key board manual. Because different model of laptops have different keys combinations for this particular purpose.
