Update index.md
Update index.md

Updated the line Create authorization rules based on complex logic (anything that can be written with node.js), to be Create authorization rules based on complex logic (anything that can be written with JavaScript) taking this issue into consideration https://github.com/auth0/rules/issues/17
Annyv2/docs,Catografix/docs,yvonnewilson/docs,Annyv2/docs,jeffreylees/docs,yvonnewilson/docs,jeffreylees/docs,hamzawi06/docs,sandrinodimattia/docs,auth0/docs,jeffreylees/docs,khorne3/docs,Catografix/docs,auth0/docs,hamzawi06/docs,Catografix/docs,khorne3/docs,sandrinodimattia/docs,yvonnewilson/docs,auth0/docs,hamzawi06/docs,Annyv2/docs,miparnisari/docs,sandrinodimattia/docs,khorne3/docs