Update getting-started-installation.md

[mickaelandrieu]

My motivation is to fix the entire world but I've decided to make by this tiny "typo fixed" PR to start my quest ;)

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[JoelMarcey]

Hi @mickaelandrieu. Thank you for the pull request. I believe npx is intentional because we are looking at using the local installation of docusaurus-init that is in node_modules - http://blog.npmjs.org/post/162869356040/introducing-npx-an-npm-package-runner

I am going to close this - but if you think I am incorrect, please let me know.

[mickaelandrieu]

Hi @JoelMarcey, I didn't know about this "new" npx binary: interesting.

You're correct 👍

Regards,