docs: Update node config comments so that they can be used for doc generation.

[winder]

Summary

Updating comments on config.Local so that they can be used to generate the node configuration page. Here I've mainly chosen the best content from the developer portal and the existing comments.

Followup PRs should be made:

• Better and more consistent formatting. Especially in cases where multiple options are listed.
• Remove unused settings. I noticed at least 5 which don't seem to be used. I only marked the ones which had minimal or missing documentation.
• Generally going through the entire list to clarify and update documentation as needed.

Test Plan

Manually ran the config_json_gen and verified that the generated markdown document looks good and has no warnings.

[codecov]

Codecov Report

Merging #5729 (2552392) into master (02b99bb) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5729      +/-   ##
==========================================
+ Coverage   55.54%   55.57%   +0.03%     
==========================================
  Files         476      476              
  Lines       66853    66853              
==========================================
+ Hits        37131    37154      +23     
+ Misses      27193    27182      -11     
+ Partials     2529     2517      -12     

Files Changed	Coverage Δ
config/localTemplate.go	69.12% <ø> (ø)

... and 16 files with indirect coverage changes

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