doc/rl-2.19: add entry for always-allow-substitutes option (backport #11775) #11781
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Motivation
Fixes #9427.
I'm not sure if I got the markdown references syntax right. Does CI check it?
Context
I was bitten by #4442 and found that the solution wasn't mentioned in the release notes yet.
Priorities and Process
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This is an automatic backport of pull request #11775 done by [Mergify](https://mergify.com).