dogshell dashboard help file needs better description/examples

[tehlers320]

something i thought i'd be able to do is:

dog dashboard show xyz-123 |jsonpp  > .datadog/dashboard.json

Then later restore

cat .datadog/dashboard.json | dog dashboard post mycooldashboard ordered 
ERROR: 'widgets' should be array

The -h is not clear how you are expected to post a dashboard.

pip list |grep datadog
datadog                       0.40.0              
datadog-api-client            1.0.0b6        

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