Fixed namespace separator
Update dic_tags.rst

  SwiftMailer plugin works only if its service defined with tag 'swiftmailer.default.plugin' and does not work with tag 'swiftmailer.plugin' specified in documentation
Update dic_tags.rst
Update dic_tags.rst
Update dic_tags.rst
Merge pull request #3199 from szjani/patch-1

Fixed namespace separator
[#3199] Making format tweaks suggested by @WouterJ
Merge pull request #3201 from mgrinko/patch-1

DI-tags documentation should contain 'swiftmailer.default.plugin' tag instead of 'swiftmailer.plugin' to work
[#3201] Minor language tweak to clarify why you might have this situation
Merge branch '2.3' into 2.4
documentation for the regex based exclusion of 404 errors with MonologBundle
[#3203] Minor tweaks to new 404 logging entry