CHANGELOG.md: Fix misspell issues

See,
$ find . -type f | xargs misspell -locale US | grep -v -e vendor -e node_modules -e devenv | grep CHANGELOG.md
./CHANGELOG.md:163:60: "organisation" is a misspelling of "organization"
./CHANGELOG.md:286:13: "Litre" is a misspelling of "Liter"
./CHANGELOG.md:394:163: "Spindel" is a misspelling of "Spindle"
./CHANGELOG.md:421:51: "metre" is a misspelling of "meter"
./CHANGELOG.md:738:73: "dashboad" is a misspelling of "dashboard"
./CHANGELOG.md:903:18: "organisation" is a misspelling of "organization"
./CHANGELOG.md:1031:48: "organisation" is a misspelling of "organization"
./CHANGELOG.md:1170:51: "cancelled" is a misspelling of "canceled"
./CHANGELOG.md:1874:97: "muliple" is a misspelling of "multiple"
./CHANGELOG.md:1909:60: "fullscren" is a misspelling of "fullscreen"