[internal] line highlights in docs are broken

[mxschmitt]

Source:

playwright/docs/src/ci.md

Line 418 in b01dd55

```yml js title=".github/workflows/playwright.yml" {20-23}

Code pointers:

• playwright/utils/markdown.js

  Line 167 in 3b86a9c

  if (content.startsWith('```')) {

• playwright/utils/markdown.js

  Line 329 in 3b86a9c

  if (node.type === 'code') {

Grepping for \{\d+-\d+\} reveals only one usage - maybe we just remove it?

[Skn0tt]

Let's make sure this gets fixed, this could be useful in the future.