Document runs.steps[*].continue-on-error for composite actions

[jsoref]

Why:

• Closes: document composite action steps[*].continue-on-error #32097

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

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• 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.

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

Source	Review	Production	What Changed
actions/sharing-automations/creating-actions/metadata-syntax-for-github-actions.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12

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

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[jsoref]

Apparently, it was documented, but only for ghes, which makes no sense.

[subatoi]

Thanks again (and thanks again for your patience), @jsoref! I'll get this merged now

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