terminology: README file update. Patch by godfath3r.
terminology: README file update. Patch by godfath3r.

Update README file for box/block selection and fix some typos.

bssb/terminology,ihorlaitan/terminology,bssb/terminology,ihorlaitan/terminology,bssb/terminology,godfath3r/terminology,godfath3r/terminology,ihorlaitan/terminology,godfath3r/terminology