docs: include composite actions in action types

[Rawal27]

Summary

• Update the list of action types to include composite actions.
• No workflow behavior or functionality changes.

Hypothesis

The documentation states that actions are either JavaScript files or Docker containers. However, GitHub also supports composite actions as a distinct action type. This update brings the statement in line with the currently supported action types.

[github-actions]

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Table of review links

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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 a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/reference/workflows-and-actions/workflow-syntax.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17

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

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