Adding a database cookbook with the topics unit tests and config_test.yml covered
Making some minor bugfixes to the testing/database cookbook. Added different code examples
[SwiftMailerHandler] Fixed 'method' option name
Fixed comments in 87c0536dab
Fixed comments in 0b7d8f41f2
Fixed comments in 0b7d8f41f2
Fix comments in ea5e1b235d
Update monolog.rst

Changed \n => &#xA; in xml example.
[Book] [Security] Fix typo
Adding the mapped type to the form type references
[Reference][Forms] Fix options type for hours, minutes, seconds
[Reference][Forms] Fix typo introduced in previous commit
Added limitations in 'Managing Common Dependencies with Parent Services' with a caution
Updated contributor branch references - 2.0 no longer maintained

The current documentation refers throughout to making bugfix and
corrections against the 2.0 branch, however this is no longer
maintained. Updated with references to 2.1 to make this more
obvious to new contributors.
[Process] Update use of Process constants
Typo fixed
Improving Web server configuration
kernel.bundle_dirs doesn't exist in KernelParameters
Remove unused code in the last code sample
Fix code blocks in contributing/code/git.rst