minor #15612 Revert the changes made in #15424 (javiereguiluz)

This PR was merged into the 4.4 branch.

Discussion
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Revert the changes made in #15424

Reverts the changes made in #15424 because of #15424 (comment)

Commits
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b61d2a9 Revert the changes made in #15424

Author: javiereguiluz

setup/symfony_server.rst

@@ -352,7 +352,7 @@ RabbitMQ      5672      ``RABBITMQ_`` (set user and pass via Docker ``RABBITMQ_D
 Elasticsearch 9200      ``ELASTICSEARCH_``
 MongoDB       27017     ``MONGODB_`` (set the database via a Docker ``MONGO_DATABASE`` env var)
 Kafka         9092      ``KAFKA_``
-MailCatcher   1025/1080 ``MAILCATCHER_``
+MailCatcher   1025/1080 ``MAILER_``
               or 25/80
 Blackfire     8707      ``BLACKFIRE_``
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