new documentation on generating JSON data

[ronanstokes-db]

Proposed changes

Documentation updates for next release

Types of changes

What types of changes does your code introduce to dbldatagen?
Put an x in the boxes that apply

• 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)
• Change to tutorials, tests or examples
• Non code change (readme, images or other non-code assets)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR.
If you're unsure about any of them, don't hesitate to ask. We're here to help!
This is simply a reminder of what we are going to look for before merging your code.

• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules
• Submission does not reduce code coverage numbers
• Submission does not increase alerts or messages from LGTM

Further comments

Documentation changes only

[codecov]

Codecov Report

Merging #151 (eb35a44) into master (04c8bd0) will not change coverage.
The diff coverage is n/a.

❗ Current head eb35a44 differs from pull request most recent head ea63d71. Consider uploading reports for the commit ea63d71 to get more accurate results

@@           Coverage Diff           @@
##           master     #151   +/-   ##
=======================================
  Coverage   90.15%   90.15%           
=======================================
  Files          22       22           
  Lines        2439     2439           
  Branches      396      396           
=======================================
  Hits         2199     2199           
  Misses        157      157           
  Partials       83       83           

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[howardwu-db]

Methods plural here