doc/user: remove mentions to PRIMARY KEY...NOT ENFORCED clause #18870
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This feature was gated to unsafe mode in #15273, but mentions to the clause were left behind in the docs.
Tips for reviewer
I removed mentions to manually setting an upsert key completely, but considered adding the following note:
Since it'd also have to be added under the section about Debezium, I thought a bit harder and maybe it's unnecessary to mention this at all. The signal we have is that users have struggled frequently with inferred keys for sinks, but not for sources. No strong opinion, though.