Sync consideration update

[bvdh]

Various updates based on comment to this section.

[isaacvetter]

Alex to add a new jira questioning if this guidance is appropriate:

A Client that initiates a context change and receives a syncerror related to a context change event it send, SHOULD resend this event at regular intervals until sync is reestablished or another, newer, event has been received. It is recommended to wait at least 10 seconds before resending the event. Note that such resend will use the timestamp of the original event to prevent race conditions.