Update components/mailer.rst as per suggestion.

Co-Authored-By: Ryan Weaver <weaverryan+github@gmail.com>

Author: harikt

components/mailer.rst

@@ -46,7 +46,7 @@ The `$email` object is created via the :doc:`Mime component </components/mime>`.
 Transport
 ---------
 
-By default, the only transport available in the mailer component is Smtp.
+The only transport that comes pre-installed with mailer is Smtp.
 
 Below is the list of other popular providers with built in support.