Update Actions `Creating a composite run steps action` for windows users

[raiden-e]

What article on docs.github.com is affected?

https://docs.github.com/en/actions/creating-actions/creating-a-composite-run-steps-action#prerequisites

As a windows user, i found it confusing to apply chmod and stumbled over a permission denied error, when I tried to run anyways. For windows users, the solution is to tell git this way:

git update-index --chmod=+x ./goodbye.sh

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[maintainer edit]

Content plan

1. The "Prerequisites" step 4 could be replaced by echo "echo Goodbye" > goodbye.sh

2. To make the file executable from windows, it looks like the preference is to use git add --chmod=+x -- goodbye.sh. It might be clearer if we create a separate tab for the Windows instructions, similar to approach taken here: https://docs.github.com/en/actions/hosting-your-own-runners/monitoring-and-troubleshooting-self-hosted-runners. See Operating system tags for more information.

For more information, see the comments in the closed PR here - (https://github.com/github/docs/pull/3073#issuecomment-811635797)

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[ramyaparimi]

This comment has some additional information for anyone who is interested in opening a PR ✨

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