$field parameter as string at Forge::addField

[dasua]

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name: Bug report
about: Help us improve the framework by reporting bugs!

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Direction
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Describe the bug
Documentation of parameter field is wrong because don't says is can be string:

CodeIgniter4/system/Database/Forge.php

Line 343 in 6507c84

* @param array $field

CodeIgniter 4 version
4.0.0-alpha.2.

Affected module(s)
class: CodeIgniter\Database\Forge
method: addField

Expected behavior, and steps to reproduce if appropriate
/**
* Add Field
*
* @PARAM array|string $field
*
* @return Forge
*/

Context

• OS: Linux 4.14.79-1-MANJARO
• Web server [e.g. Apache 2.4]
• PHP version [7.2.11]
• PhpStorm [2018.2.5]