(v8.x backport) lib,test: fix spelling in comments#19118

tniessen wants to merge 2 commits intonodejs:v8.x-stagingnodejs/node:v8.x-stagingfrom

tniessen:backport-18018-to-v8.xtniessen/node:backport-18018-to-v8.xCopy head branch name to clipboard