CMakeLists.txt: minor documentation correction
CMakeLists.txt: minor documentation correction

frobware/cmd-key-happy,andymcd/cmd-key-happy,andymcd/cmd-key-happy,andymcd/cmd-key-happy,andymcd/cmd-key-happy,frobware/cmd-key-happy,frobware/cmd-key-happy,frobware/cmd-key-happy,andymcd/cmd-key-happy,frobware/cmd-key-happy