fre/analysis documentation

[mlee03]

Describe your changes

This PR updates the documentation in fre/analysis

Issue ticket number and link (if applicable)

Fixes #XXX (replace XXX with the issue number and GitHub will autolink the PR to the issue)

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback
• No print statements; all user-facing info uses logging module

Note: If you are a code maintainer updating the tag or releasing a new fre-cli version, please use the release_procedure.md template. To quickly use this template, open a new pull request, choose your branch, and add ?template=release_procedure.md to the end of the url.