Fix spec URL for RegExp.p.hasIndices (#10194)
Fix spec URL for RegExp.p.hasIndices (#10194)

RegExp.p.hasIndices isn’t yet in the ES spec; instead it’s part of a
stage 3 proposal at https://tc39.es/proposal-regexp-match-indices/
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data