docs: remove leading $ from script examples

[MeAkib]

Copy-pasting commands like $ pnpm lint caused errors in shells (e.g. zsh). Updated docs to use pnpm lint directly so they run without modification.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/main/contributing-docs/commit-message-guidelines.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.dev application / infrastructure changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[github-actions]

Deployed adev-preview for dc01620 to: https://ng-dev-previews-fw--pr-angular-angular-63795-adev-prev-41nkpt59.web.app

Note: As new commits are pushed to this pull request, this link is updated after the preview is rebuilt.

[josephperrott]

LGTM

[thePunderWoman]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 1004418
• 20.3.x: 7eb5f9a

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}