Hiding attribute values that are not useful

[zachmprince]

What is the change?

In the PDF build of the docs, there are some instances of overly verbose and extremely long content that was automatically generated. These are a few of them that I found:

• List of Nuclides table. Now this is only built with the PDF
• energyGroups.GROUP_STRUCTURE
• constant.DPA_CROSS_SECTIONS
• test_customIsotopics.TestCustomIsotopics.yamlString

The last three are removed using :meta hide-value: which tells sphinx to not display the value of the attribute.

Why is the change being made?

Ongoing SQA effort

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Checklist

• [ ] This PR has only one purpose or idea.
• [ ] Tests have been added/updated to verify that the new/changed code works.

• [ ] The code style follows good practices.
• [ ] The commit message(s) follow good practices.

• [ ] The release notes (location doc/release/0.X.rst) are up-to-date with any important changes.
• [ ] The documentation is still up-to-date in the doc folder.
• [ ] If any requirements were affected, mention it in the release notes.
• [ ] The dependencies are still up-to-date in pyproject.toml.