API spec of the different JSON schema fields

[jenmuell]

• This pull request will close the issue White on white can be hard to read #1045 (Docs: Parameter schema website#1045)
• I added a paragraph about the API spec of the different JSON schema fields. I focused on the JSON fields, that are present in the API

PR checklist

• [ x] This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #2215 (fe63c0b) into dev (c655a60) will increase coverage by 0.12%.
The diff coverage is 50.00%.

❗ Current head fe63c0b differs from pull request most recent head 83a7d87. Consider uploading reports for the commit 83a7d87 to get more accurate results

@@            Coverage Diff             @@
##              dev    #2215      +/-   ##
==========================================
+ Coverage   71.83%   71.95%   +0.12%     
==========================================
  Files          77       77              
  Lines        8365     8363       -2     
==========================================
+ Hits         6009     6018       +9     
+ Misses       2356     2345      -11     

Impacted Files	Coverage Δ
nf_core/subworkflows/test_yml_builder.py	15.48% <0.00%> (+0.31%)	⬆️
nf_core/modules/test_yml_builder.py	51.36% <100.00%> (+0.69%)	⬆️

... and 7 files with indirect coverage changes

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