DM-1174: fix streaming docs
Created by: mattclarke
Description of work
Some of the documentation was out of date, specifically relating to streams. This PR fixes that and updates other parts of the commands.md file too.
Also, removed some legacy documentation.
Issue
Closes DM-1174
Acceptance Criteria
Make sure the commands.md file makes sense.
Unit Tests
N/A
Other
N/A
Code Review (To be filled in by the reviewer only)
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Is the code of an acceptable quality? -
Do the changes function as described and is it robust?
Nominate for Group Code Review (Anyone can nominate it)
Indicate if you think the code should be reviewed in a Thursday code review session.
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Recommend for group code review
Also, nominate it on the code_review Slack channel (does someone want to automate this?).