Media Analytics Examples Clean-up

## What are the schemas that are affected by the issue
None

## What are examples of products that are impacted by the issue
* Adobe Media Analytics

Internal JIRA issue: https://jira.corp.adobe.com/browse/VA-3240

High-level changes:
* changes in examples for some Media Analytics schemas to make them more generic, in order to more accurately show what kind of data the fields hold

No repository file, test, or affected schema is named; start by locating the Media Analytics schemas and reviewing the linked issue details if access is available. Compare the existing examples with the intended generic descriptions, and consider the work done when the affected schema examples accurately represent the kinds of data their fields hold.

Written by the indexing model from the issue text.