Fix name of launch option in docs

[ILikeToHelp]

This launch option was renamed to "Extenstion" in be2ae45.

Documentation change only. So I've deleted the checklist.

Please could you add "skip news" label?

[codecov-io]

Codecov Report

Merging #8113 into master will increase coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8113      +/-   ##
==========================================
+ Coverage   58.91%   59.22%   +0.31%     
==========================================
  Files         498      498              
  Lines       22427    22427              
  Branches     3602     3607       +5     
==========================================
+ Hits        13212    13283      +71     
+ Misses       8380     8309      -71     
  Partials      835      835

Impacted Files	Coverage Δ
src/client/language/characters.ts	33.33% <0%> (+2.56%)	⬆️
src/client/common/utils/version.ts	81.48% <0%> (+3.7%)	⬆️
src/client/providers/providerUtilities.ts	88.88% <0%> (+5.55%)	⬆️
src/client/datascience/cellFactory.ts	89.65% <0%> (+13.79%)	⬆️
src/client/api.ts	92.85% <0%> (+14.28%)	⬆️
src/client/common/utils/icons.ts	100% <0%> (+16.66%)	⬆️
src/client/formatters/serviceRegistry.ts	100% <0%> (+25%)	⬆️
...t/datascience/jupyter/jupyterDataRateLimitError.ts	100% <0%> (+33.33%)	⬆️
src/client/testing/codeLenses/main.ts	77.77% <0%> (+33.33%)	⬆️
src/client/testing/serviceRegistry.ts	95.49% <0%> (+46.84%)	⬆️

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[kimadeline]

Thank you for your contribution @HackingAndJiuJItsu 👍 Let me know if you want to add an issue in order to thank yourself. If not, I'll merge your PR.