Add enqueued and dequeued to pull_request_target

[thejcannon]

Why:

These are valid but missing

Closes: (Didn't bother opening an issue)

What's being changed (if available, include any code snippets, screenshots, or gifs):

Just the docs of GitHub Actions "Events that trigger workflows"

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[github-actions]

How to review these changes 👓

Thank you for your contribution. To review these changes, choose one of the following options:

• Spin up a codespace
• Set up a local development environment

A Hubber will need to deploy your changes internally to review.

Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/reference/events-that-trigger-workflows.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[Sharra-writes]

Thanks for opening a PR! It looks like you've got an extra <br> in there that's causing it to preview incorrectly, but I can't suggest changes. Can you enable the checkbox to allow maintainer edits? I need that permission before I can get this merged, even if you remove the extra <br>. Thank you! https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/allowing-changes-to-a-pull-request-branch-created-from-a-fork

[thejcannon]

@Sharra-writes I couldn't figure out how to do that on mobile, so I just left a suggestion I'll apply