docs: Update the environment variables used for Mercure #1432
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Since API Platform 2.6.5 the
mercure.hub_url
configuration is ignored if the Mercure bundle used is version ^0.3 and includes theDiscovery
classThe environment variables for the Mercure component are different so I have updated this documentation. I have not mentioned there is an option to use the
hub_url
configuration option. It may be worth mentioning in a comment on the configuration that the option is deprecated.also see: api-platform/core#4451
The link to the Symfony external parameter configuration was also broken.