Clarifier dcupdate

[clare45]

Pull request recommendations:

• [x ] Name your branch/PR your-development-type/short-description. Ex: feature/read-tiff-files
• [ ] Link to any relevant issue in the PR description. Ex: Resolves [gh-12], adds tiff file format support
• [ x] Provide context of changes.
• [ ] Provide relevant tests for your feature or bug fix.
• [ ] Provide or update documentation for any feature added by your pull request.

Thanks for contributing!

updating with extra info for clarifying the units and parameters in the DC, adding variable descriptions to filtration