docs: improve yarn deps upgrade command

[webbertakken]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

#> yarn upgrade
Usage Error: Couldn't find a script named "upgrade".

$ yarn run [--inspect] [--inspect-brk] [-T,--top-level] [-B,--binaries-only] <scriptName> ...

Instead use yarn add to update to the latest version. Also don't add @latest, because that will put the @latest constraint in package.json, which can cause silent major upgrades, as it's a rolling tag.

Test Plan

Test links

It's this page: https://docusaurus.io/docs/installation

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

None

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[slorber]

Thanks 👍

As far as I understand it only affects newer Yarn versions where the command is now yarn up. Replacing by add looks like a nice alternative (and it works fine on Yarn v1 too, just tested it)