Feature 2748 document ugrid

[DanielAdriaansen]

Closes #2748

View the documentation here: https://met--2869.org.readthedocs.build/en/2869/Users_Guide/appendixH.html

• [x] Do these changes introduce new tools, command line arguments, or configuration file options? [Yes or No]
  If yes, please describe:
  No

• [x] Do these changes modify the structure of existing or add new output data types (e.g. statistic line types or NetCDF variables)? [Yes or No]
  If yes, please describe:
  No

Pull Request Testing

• [x] Describe testing already performed for these changes:
  I built the docs locally on Seneca and viewed them in my browser. They appear as I expect them to.

• [x] Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  Review content for accuracy of what the code is doing. Review for missing content. Review for important limitations I may have left out.

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

• [x] Do these changes include sufficient testing updates? [Yes or No] Yes

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

• [x] Will this PR result in changes to existing METplus Use Cases? [Yes or No]
  If yes, create a new Update Truth METplus issue to describe them. No

• [x] Do these changes introduce new SonarQube findings? [Yes or No]
  If yes, please describe: No

• [ ] Please complete this pull request review by [Fill in date].
  

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[DanielAdriaansen]

@willmayfield can you take a quick look at the updated docs before we merge? Here is the link: https://met.readthedocs.io/en/feature_2748_document_ugrid/Users_Guide/appendixH.html

[DanielAdriaansen]

@JohnHalleyGotway @hsoh-u this is ready to go but GitHub says: "At least 1 approving review is required to merge this pull request."

Must be @willmayfield review does not count as an "approving review"?

Could someone add their review so this can be merged? Thanks.