Missing return value documentation for nd.random.* and sym.random.*

[eric-haibin-lin]

The operators in https://mxnet.incubator.apache.org/api/python/ndarray/random.html#random-distribution-generator don't mention the return value types and the number of return values.

• multinomial
• generalized_negative_binomial
• negative_binomial
• gamma
• exponential
• randn

[zachgk]

@mxnet-label-bot add [Python]

Thank you for submitting the issue! I'm labeling it so the MXNet community members can help resolve it.

[aaronmarkham]

@mxnet-label-bot add [good first issue]
The operators don't have documentation on their return type. Someone could play with them and to get familiar with them and then add the return type info using the ops that have it specified as a template.

[zboldyga]

I'll check this out tonight and/or tomorrow!

[thomelane]

@zboldyga did you get a chance to check this out? let me know if not, and i'll take a look. thanks!

[zboldyga]

@thomelane whoops, I lost track of this one after the holidays. It's mostly complete but I need to revise and submit a pull request this weekend. Thanks for the reminder!

[safrooze]

@zboldyga gentle check to see if you've submitted a PR?

[zboldyga]

Just filed it: #13994 😄