docs: resolve typos in imports on highlight addon docs

[dprcoles]

What I did

Small change to fix a typo that was causing an issue with the rendering of the code snippet that is shown on the Highlight Addon page.

Updated form --> from to resolve syntax highlighting issues.

Also updated 2 related snippet files that had the same typo.

How to test

N/A

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "build", "documentation", "maintenance", "dependencies", "other"]

[jonniebigodes]

@dprcoles, thanks for putting together this pull request and helping us improve the documentation by catching those small but rather important typos. We appreciate it 🙏 !

I've checked, and all is good on my end.

Heads up @yannbf, @valentinpalkovic, I'm aware that the pretty-docs task is failing, but I'll merge this once the checklist clears, as this is a minor documentation change, and I'm going to make some updates to it this week.