[Docs] Academy: Example use of REST APIs

[leecalcote]

Current State

The Cloud Academy has a number of APIs available, none of which have example uses documented.

Desired State

1. Create an example of how to use our Academy REST API to retrieve various statistics / information, for example:
   1. the current number of active learners
   2. the total number of registered learners
2. Include these and/or others as an example under the Academy section of the Cloud docs.
3. Link to those examples from the REST API reference page.
4. Minimally, examples can use curl. Ideally, these examples also include other languages (e.g. javascript, python, golang).

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[Siddhi-sahu]

Hello @Vincamine @leecalcote 👋. I would like to work on this!

[leecalcote]

Thanks, @Siddhi-sahu!