docs(v2): fix npm/yarn command example for swizzling TypeScript theme components

[YashTotale]

Motivation

The example was not working, because there was no extra -- in front of --typescript

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Testing is pretty simple: run the previous example on the command line which does not work as the --typescript is interpreted as part of the npm command, and run the new example with an extra -- which does work as the --typescript is interpreted as an option for the docusaurus command.

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[netlify]

[V1] Deploy preview failure

Built without sensitive environment variables with commit 9b59a91

https://app.netlify.com/sites/docusaurus-1/deploys/602ca6629f06ad0007e10e80

[netlify]

Deploy preview for docusaurus-2 ready!

Built without sensitive environment variables with commit 9b59a91

https://deploy-preview-4230--docusaurus-2.netlify.app

[github-actions]

Size Change: 0 B

Total Size: 158 kB

ℹ️ View Unchanged

Filename	Size	Change
website/build/assets/css/styles.********.css	17.6 kB	0 B
website/build/assets/js/main.********.js	111 kB	0 B
website/build/blog/2017/12/14/introducing-docusaurus/index.html	21.7 kB	0 B
website/build/docs/introduction/index.html	180 B	0 B
website/build/index.html	6.95 kB	0 B

_{compressed-size-action}

[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	77
🟢 Accessibility	96
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-4230--docusaurus-2.netlify.app/classic/

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[slorber]

thanks

was already fixed in upcoming release but not a bad idea to backport :)