message: docs: fix up language in websocket arch overview
diff: @@ -20,7 +20,7 @@ Connection semantics
  --------------------
  Even though WebSocket upgrades occur over HTTP/1.1 connections, WebSockets
  -proxying works similar to plain TCP proxy, i.e., Envoy does not interpret
  +proxying works similarly to plain TCP proxy, i.e., Envoy does not interpret
  the websocket frames. The downstream client and/or the upstream server are
  responsible for properly terminating the WebSocket connection
  (e.g., by sending `close frames <https://tools.ietf.org/html/rfc6455#section-5.5.1>`_)
  