docs: update options for next

[snitin315]

What kind of change does this PR introduce? docs.

Did you add tests for your changes? No.

If relevant, did you update the documentation? Yes.

Summary

Fix https://github.com/webpack/webpack-cli/pull/3365

All breaking changes related to commands and options are done we can update docs now.

• Update docs.
• Remove SERVE-OPTIONS-v3.md

Does this PR introduce a breaking change? No

Other information No

[codecov[bot]]

Codecov Report

Merging #3423 (e103a94) into next (ee91c94) will decrease coverage by 3.29%. The diff coverage is 91.30%.

:exclamation: Current head e103a94 differs from pull request most recent head 5241477. Consider uploading reports for the commit 5241477 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3423      +/-   ##
==========================================
- Coverage   94.91%   91.61%   -3.30%     
==========================================
  Files          30       22       -8     
  Lines        1690     1587     -103     
  Branches      492      447      -45     
==========================================
- Hits         1604     1454     -150     
- Misses         86      133      +47     

Impacted Files	Coverage Δ
packages/generators/src/handlers/react.ts	56.81% <56.81%> (ø)
packages/webpack-cli/bin/cli.js	85.71% <66.66%> (+19.04%)	:arrow_up:
packages/generators/src/index.ts	79.54% <75.67%> (-20.46%)	:arrow_down:
packages/serve/src/index.ts	78.94% <78.76%> (-5.33%)	:arrow_down:
...ges/webpack-cli/src/utils/dynamic-import-loader.ts	83.33% <83.33%> (ø)
packages/generators/src/loader-generator.ts	91.66% <85.71%> (ø)
packages/generators/src/init-generator.ts	87.50% <86.11%> (-10.46%)	:arrow_down:
packages/generators/src/addon-generator.ts	92.72% <92.15%> (+0.13%)	:arrow_up:
packages/webpack-cli/src/webpack-cli.ts	93.45% <93.45%> (ø)
packages/generators/src/utils/helpers.ts	95.00% <93.75%> (+10.00%)	:arrow_up:
... and 14 more

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