Update doc_tools and clean up GenX docs

[RuaridhMacd]

Description

Resolves issues we were having integrating GenX documentation.

Previously, the GenX documentation was automatically being merged with the DOLPHYN documentation. This led to repeat calls to documentation for some functions with the same names in both codebases. Sometimes, this just led to warnings when building the documentation, but at other times the function doctoring would only be successfully added to the doc in one place, leaving gaps elsewhere.

Fixes issue #

Resolves #192

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

The documentation now builds locally for me.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have run tests with my code to avoid compatibility issues
• Any dependent changes have been merged and published in downstream modules