[guide] quotes: corrected casing
[guide] quotes: corrected casing

Updated case to read the same in multiple spots. Added single quote example

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