fix: improve description of magicHtml option

[snitin315]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

No

Motivation / Use-Case

improve the description of magicHtml option

Breaking Changes

None

Additional Info

No

[codecov]

Codecov Report

Merging #3772 (aad8c9b) into master (dfca34e) will increase coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3772      +/-   ##
==========================================
+ Coverage   92.88%   93.03%   +0.15%     
==========================================
  Files          14       14              
  Lines        1321     1321              
  Branches      463      463              
==========================================
+ Hits         1227     1229       +2     
+ Misses         87       85       -2     
  Partials        7        7              

Impacted Files	Coverage Δ
bin/cli-flags.js	100.00% <ø> (ø)
lib/servers/WebsocketServer.js	97.14% <0.00%> (+5.71%)	⬆️

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[alexander-akait]

@snitin315 webpack can generate .mjs when you use outputModules: true, I think we should fix it too

[snitin315]

@snitin315 webpack can generate .mjs when you use outputModules: true, I think we should fix it too

On it.