Remove misleading reference to one-var eslint rule
Remove misleading reference to one-var eslint rule

This eslint rule does not enforce this style guide rule. I believe that
referencing it here will cause people to believe that this is enforced
via linting when it is not. As far as I know, there is no rule that
currently enforces this, but it would be nice to add one.

LodoSoftware/javascript-style-guide,getjll/JavaScript-Style-Guide,ljharb/javascript,LodoSoftware/javascript-style-guide,nulogy/javascript,naustudio/javascript,bl00mber/javascript,webcoding/javascript-style-guide,appcom-interactive/javascript,xalexec/javascript,airbnb/javascript,allanfish/javascript,practicefusion/javascript,pokelondon/javascript,addshoppers/javascript,whichdigital/javascript-coding-standards,cloudability/javascript-style-guide,naustudio/javascript