Docs: Update no-multi-assign explanation (#12615)
Docs: Update no-multi-assign explanation (#12615)

* Docs: Update no-multi-assign explanation

Update description to explain "unexpected results". Also update examples to include ES6 syntax.

* Update no-multi-assign.md

Rephrased by @kaicataldo.

Trott/eslint,DavidAnson/eslint,eslint/eslint,Trott/eslint,whitneyit/eslint,whitneyit/eslint,platinumazure/eslint,platinumazure/eslint,pvamshi/eslint,DavidAnson/eslint,pvamshi/eslint,eslint/eslint