symfony/symfony-docs — pull request #3201 by mgrinko (2013-11-18 12:04:55+00:00)
Title: DI-tags documentation should contain 'swiftmailer.default.plugin' tag instead of 'swiftmailer.plugin' to work

SwiftMailer plugin works only if its service defined with tag 'swiftmailer.default.plugin' and does not work with tag 'swiftmailer.plugin' specified in documentation