Mention rmw_specific_{pub,sub}_payload in rmw impl tutorial (backport #5967) #5969
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Description
Follow-up to #5927.
The general statement here about the interface not supporting passing arbitrary configurations wasn't entirely correct. See ros2/rclcpp#882.
This still doesn't mean that you can arbitrarily configure anything, since this is only for publishers/subscriptions, though.
Did you use Generative AI?
Additional Information
This is an automatic backport of pull request #5967 done by [Mergify](https://mergify.com).