Update documentation to point to new default DDS (bp #1000) (bp #1002)

[mergify]

This is an automated backport of pull request #1002 done by Mergify

Cherry-pick of 9a25574 has failed:

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	both modified:   source/Tutorials/Working-with-multiple-RMW-implementations.rst

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Cherry-pick of 3bc9cae has failed:

On branch mergify/bp/dashing/pr-1002
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	both modified:   source/Tutorials/Working-with-multiple-RMW-implementations.rst

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[clalancette]

This one doesn't need to be backported to Dashing, so closing.