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I'm running into the below error ClientConnectorError Cannot connect to host www.datasciencetoolkit.org:80 ssl:default [nodename nor servname provided, or not known] any ideas ?

We tried to install typing extensions with version 3.9.7 but it did not allow us to.

### Summary of changes Removed deprecated command from the docs and clarified required format for the --image-ref argument in the ```fly postgres create --snapshot-id --image-ref $REPOSITORY:$TAG``` command.