Fixes github/docs#33389

[beremonsivais]

A note is added to clarify when the configuration variables at the environment level are automatically available.

Why:

The example in https://docs.github.com/en/actions/learn-github-actions/contexts#example-usage-of-the-vars-context states that configuration variables at the environment level are automatically available. The example fails if the environment is not declared beforehand.

Closes: #33389

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

A note was added to the example https://docs.github.com/en/actions/learn-github-actions/contexts#example-usage-of-the-vars-context

Check off the following:

• I have reviewed my changes in staging, available via the View deployment link in this PR's timeline (this link will be available after opening the PR).

  • For content changes, you will also see an automatically generated comment with links directly to pages you've modified. The comment won't appear if your PR only edits files in the data directory.

• For content changes, I have completed the self-review checklist.

[github-actions]

Automatically generated comment ℹ️

This comment is automatically generated and will be overwritten every time changes are committed to this branch.

The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
actions/writing-workflows/choosing-what-your-workflow-does/accessing-contextual-information-about-workflow-runs.md	fpt ghec ghes@ 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.14 3.13 3.12 3.11 3.10

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

[nguyenalex836]

@beremonsivais Thank you very much for submitting this PR! ✨

While your content changes look great, would you mind formatting your note to match the other notes in this doc? 💛 See the note immediately under this heading as an example

[nguyenalex836]

@beremonsivais Your changes look perfect 💛 I'll update the branch and get this merged once tests are passing 🍏

[github-actions]

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