Add `and`  to description (#5253)
Add `and`  to description (#5253)

* Add  to description

* Update content/en/docs/concepts/what-is-istio/index.md

Co-Authored-By: Martin Taillefer <0e4690f498a6a52b2d38722c8f62660cdc7447b1@users.noreply.github.com>

istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io