Update mercure.rst regarding JWT token secret #16151
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The documentation for the configuration of mercure seems quite wrong: it has a big "caution" block stating that the
MERCURE_JWT_SECRET
should contain an actual JWT ... instead of a secret, which is weird (and definitely not how it works).I propose to remove these (maybe out of date?) parts to prevent further confusion (I spent a full day examining the actual source to understand what was really needed in the env var).
Also, added a tip on how setting the cookies twice would not work.