Fix nullish coalescing operator#685

Andrii256 wants to merge 2 commits intojavascript-tutorial:masterjavascript-tutorial/uk.javascript.info:masterfrom

Andrii256:2-12-nullish-coalescing-operator-typos-and-misunderstanding-fixAndrii256/ops_uk.javascript.info:2-12-nullish-coalescing-operator-typos-and-misunderstanding-fixCopy head branch name to clipboard