[Doc] add explanations for encryption context in WebSocket (#12810)
[Doc] add explanations for encryption context in WebSocket (#12810)

* [Doc] add explanations for encryption context in WebSocket

* update

* Update site2/docs/client-libraries-websocket.md

Co-authored-by: Marvin Cai <a938dfdfbaa1f25ccbc39e16060f73c44e5ef0dd@streamnative.io>

* update 2

Co-authored-by: Marvin Cai <a938dfdfbaa1f25ccbc39e16060f73c44e5ef0dd@streamnative.io>
yahoo/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar,merlimat/pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar