Modified "Types of Motherboards" section to point to how ATX is common mostly for desktop and server computers. Mentioned how many Single Board Computers such as the Raspberry Pi use their own form factor not based off the ATX standard.
Changed wording comparing desktops and laptops in final sentence of first paragraph. Edited wording listing manufacturers of motherboards. Add "t" to must in line 21, reworded sentence, and added "brands" to examples. Added "from the power supply." Rewording to connectors description.