minor #929 Update introduction.rst (chshanovskiy)
minor #929 Update introduction.rst (chshanovskiy)

This PR was merged into the 6.0-dev branch.

Discussion
----------

Update introduction.rst

Added brackets to Swift_Message instantiation

Commits
-------

83b0334 Update introduction.rst

jamesggordon/swiftmailer,swiftmailer/swiftmailer,jamesggordon/swiftmailer,voku/swiftmailer,c960657/swiftmailer,Rotzbua/swiftmailer,Rotzbua/swiftmailer,voku/swiftmailer,gencer/swiftmailer,gencer/swiftmailer,c960657/swiftmailer,michabbb-backup/swiftmailer,swiftmailer/swiftmailer,michabbb-backup/swiftmailer