Docs: Fix e2e command typos

[eduwass]

What?

Looks like there were 2 typos on some of the e2e commands in the test-e2e section

Why?

I noticed that the commands were not working when I copy/pasted them while I was going through the doc.

How?

Just replace npm run test-e2e with npm run test:e2e.

This should prevent future folks from getting confused.

Testing Instructions

1. Go to https://developer.wordpress.org/block-editor/reference-guides/packages/packages-scripts/#test-e2e
2. If you've been following the steps, and copied one of the commands, you will run into an error:

➜ npm run test-e2e FILE_NAME -- --puppeteer-interactive
npm ERR! Missing script: "test-e2e"
npm ERR! 
npm ERR! Did you mean this?
npm ERR!     npm run test:e2e # run the "test:e2e" package script
npm ERR! 
npm ERR! To see a list of scripts, run:
npm ERR!   npm run

Testing Instructions for Keyboard

Not needed

[github-actions]

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[alexstine]

@eduwass Thanks for the PR. Once upon a time, test-e2e was correct. Now it is test:e2e. Nice catch. 👍

[github-actions]

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