document rows parameter for textarea component

Adds a `rows` parameter to the `textarea` component to control the
number of rows displayed.

#993

Author: lovasoa

examples/official-site/sqlpage/migrations/01_documentation.sql

@@ -306,6 +306,7 @@ INSERT INTO parameter(component, name, description, type, top_level, optional) S
     ('prefix','Text to display on the left side of the input field, on the same line.','TEXT',FALSE,TRUE),
     ('suffix','Short text to display after th input, on the same line. Useful to add units or a currency symbol to an input.','TEXT',FALSE,TRUE),
     ('readonly','Set to true to prevent the user from modifying the value of the input field.','BOOLEAN',FALSE,TRUE),
+    ('rows','Number of rows to display for a textarea. Defaults to 3.','INTEGER',FALSE,TRUE),
     ('disabled','Makes the field non-editable, non-focusable, and not submitted with the form. Use readonly instead for simple non-editable fields.','BOOLEAN',FALSE,TRUE),
     ('id','A unique identifier for the input, which can then be used to select and manage the field with Javascript code. Usefull for advanced using as setting client side event listeners, interactive control of input field (disabled, visibility, read only, e.g.) and AJAX requests.','TEXT',FALSE,TRUE)
 ) x;