Allow using multi-line docblocks for generated properties

[Gert-dev]

Currently properties are always generated with a one-liner docblock, like so:

/** @var Type $test */
private $test;

It would be neat if there was an option for allowing the multi-line syntax as well:

/**
 * @var Type $test
 */
private $test;

Some projects have rules pertaining to the format used, i.e. I believe Doctrine projects favor the first syntax, but rulesets (I think Slevomat, but I'm not sure?) allow enforcing the latter for consistency.

An alternative would be to allow configuring a template to use, but a new configuration option will do the job as well.

Thanks!