Usage text/plain create varchar(255) and not mediumtext

[lucaslaurent04]

In the documentation it is explained that using type "string" and usage "text/plain" will create a column mediumtext in the database, but when I tested it created a varchar(255).

Maybe the doc is wrong or the maybe a bug need to be fixed in eQual code.

equal-doc/docs/usage/model-definition.md

Lines 148 to 156 in 372dd41

	For instance:
	```php
	<?php
	[
	'type' => 'string',
	'usage' => 'text/plain'
	]
	```
	will be stored as MEDIUMTEXT and the UI will know it has to display the field as a TEXTAREA rather than as an INPUT.