Update design_overview.md

doc/design_overview.md

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 Within the Databag system, clients connect to nodes with both a websocket and a REST API. The websocket is used to communicate events while the REST API transfers the content. The nodes also communicate events between each other over a notification connection. However, importantly no content is synchronized between nodes.
 
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 When a subject posts data that is shared with another contact to the subject’s node:
 1. Subject’s node receives the data from the subject’s client over the REST API.
 2. Subject’s node notifies the contact’s node over the Notification Endpoint.