chore(config): add plugin comment

[sleepdefic1t]

Summary

Minor change adding a comment about changing the plugin config.

It's already fairly obvious the plugin section shouldn't be changed when you look at what it does,
but this comment could still be pretty useful for others.

// This section handles fetching Desktop-Wallet Plugins from the NPM registry.
// It should remain "ARK" unless intentionally implementing a custom package.

Checklist

• Ready to be merged

[codecov]

Codecov Report

Merging #1907 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1907   +/-   ##
========================================
  Coverage    59.04%   59.04%           
========================================
  Files          373      373           
  Lines         9294     9294           
  Branches      1921     1921           
========================================
  Hits          5488     5488           
  Misses        3580     3580           
  Partials       226      226           

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