Added some xml formats
Use routes for security paths, instead of raw paths
Updating some component headings to fit the style used for others
Adding a note describing the configuration of SQLite with doctrine
Adding xml and php configuration to the doctrine sqlite configuration
Bugfixing incorrect codeblocks
Adding a configuration block
[#1640] Removed framework.session.auto_start setting
[#1708] Fixed description of single_text date widget
Added missing formats
Fixed interpunction, thanks to @ricardclau
[Assetic] added a note about the need to remove a route

_assetic route needs to be removed when use_controller is set to
false.
fixed typo
Fixed issues, thanks to @weaverryan
Better doc when using GMail transport Edit

If your are using Symfony Standard Edition, there is a way to configure the GMail transport from parameters.yml without change the config files.
Remove configuration-block
Improve indentation for code block
Right indentation for tip
Added 'the' before Symfony Standard Edition, it sounds better
Minor fix: remove the unnecessary list item.