Documentation: Make Headers Consistent in METcalcpy User's Guides

[jprestop]

This is a sub-issue of METplus: Documentation: Make Headers Consistent in METplus components User's Guides #898.

Describe the Sub-Issue

This task is for all METplus component. This specific issue is for METcalcpy only:

The headers for the METplus components User's Guides may not be consistent, but we want them to be.

Here is the syntax from the RST docs (https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#sections):

# with overline, for parts (e.g. the RTD documentation for the component (i.e. docs/index.rst), each guide (e.g. User's Guide, Contributor's Guide) (i.e. docs/Users_Guide/index.rst, docs/Contributors_Guide/index.rst))
* with overline, for chapters
=, for sections
-, for subsections
^, for subsubsections
", for paragraphs

Time Estimate

1 to 3 days of work

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[lisagoodrich]

@jprestop I added ### for the titles in the index.rst files to match the "parts" formatting. Then I thought I was supposed to take the bolded titles and turn them into chapters. If I do this, I mess up the Table of Contents (TOC). I'm pretty sure the chapter change is the problem. I'll wait to discuss this before creating a pull request.

[lisagoodrich]

The develop/docs/index.rst file was missed in the original pull request. The headers need to be changed to = instead of #