Fix obs_diag ranked histogram documentation links

[c-merchant]

Description:

This is a fix to the documentation links for guidance on creating ranked histograms with ncview and matlab for threed_cartesian and threed_sphere obs_diag. They link to the documentation for ncview and the guide on analyzing observation space with MATLAB.

Fixes issue

Issue #657

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Documentation update

Documentation changes needed?

• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.

Tests

I built and ran the DART documentation locally with Sphinx and ran the classic ./quickbuild.sh to make sure things hadn't been thrown off.

Checklist for merging

• [ ] Updated changelog entry
• [x] Documentation updated
• [ ] Update conf.py

Checklist for release

• [ ] Merge into main
• [ ] Create release from the main branch with appropriate tag
• [ ] Delete feature-branch

Testing Datasets

• [ ] Dataset needed for testing available upon request
• [ ] Dataset download instructions included
• [x] No dataset needed

[hkershaw-brown]

Thanks Charlotte, the fix looks good. As you mentioned there's a commit history with a few experiments here, I'm going to go ahead and squash the commits to keep tidy.

The obs_diag pages all have a broken link to 'ncview' at the bottom of each page, I'll switch this out with the working link since I'm squashing.

This is out of scope for this request, but there is loads of repeated documentation between these pages:

PROGRAM obs_diag (for 1D observations) PROGRAM obs_diag (for observations that use the threed_cartesian location module) PROGRAM obs_diag (for observations that use the threed_sphere location module)