Tutorial Updates

[abachma2]

Summary of Changes

This PR addresses some of the items identified by me in #427 to update the user tutorial. The changes are generally pretty minor: fixing typos, correcting formats, making things consistent across the tutorial. Some of the wording changes improve the clarity of the tutorial for me and I welcome discussion if you think the changes make things less clear.

Design Notes

Check the box if your change does not break any of the following:

• API for Cyclus modules
• Input files
• Output tables for post processing tools

Related CEPs and Issues

This PR addresses some of the items in #427, but not all of them so the issue should remain open after merging.

Associated Developers

Testing and Validation

• I have read the Contributing to Cyclus guide
• I have compiled and run the code locally
• I have added or updated relevant tests
• I have added documentation for new or changed features
• This code follows the style guide
• I have updated the changelog

Reviewers, please refer to the Cyclus Guide for Reviewers.

[gonuke]

See also #426

[abachma2]

See also #426

I will add that to the Tutorial update project. I don't want to do that update with this PR to maintain some formal scope. I can get another PR in to address that issue.