Feature 238 headers

[lisagoodrich]

Pull Request Testing

• Describe testing already performed for these changes:
  

• I have reviewed all of the User's Guide files including the index.rst files and updated to the correct header formatting.

• I also capitalized some of the headers to match formatting across the documentation.

• I compared the develop web pages to the feature_238_headers web pages all of the headers are in the correct position. The index and Chapters 1-6 were reviewed.

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  Please review for any inconsistencies or details that I might have missed. Were there any other documentation sections?

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [No, there are no errors]

• Do these changes include sufficient testing updates? [Yes]

• Will this PR result in changes to the test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Please complete this pull request review by 10/27/23.
  

Pull Request Checklist

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• Complete the PR definition above.
• Ensure the PR title matches the feature or bugfix branch name.
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  Select: Reviewer(s)
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  Select: Milestone as the version that will include these changes
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[jprestop]

@lisagoodrich I reviewed all of the User's Guide files both in the "Files Changed" area of this PR and in RTD. Thanks for those additional capitalization fixes and for all of your work on this task. I have ensured that all tests passed. I approve this PR.

[jprestop]

@lisagoodrich Please merge the pull request, delete your branch, and close the sub-task issue when you can.

[lisagoodrich]

@jprestop I do not have permission to merge in the changes on this branch. Is this something @bikegeek could do?

[jprestop]

It's ok @lisagoodrich. I can take care of it.