Revert "adding API change for spin_until_complete" (backport #3333)

[mergify]

This is an automatic backport of pull request #3333 done by Mergify.
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	deleted by us:   source/Tutorials/Advanced/FastDDS-Configuration.rst
	both modified:   source/Tutorials/Beginner-Client-Libraries/Custom-ROS2-Interfaces.rst

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