docs: fix transformer generator namespace command example

[datamweb]

Description

PS I:\work\Github\CI4> php spark make:transformer User --namespace MyCompany\API

CodeIgniter v4.7.3 Command Line Tool - Server Time: 2026-06-05 08:18:45 UTC+03:30

File exists: "APPPATH\ThirdParty\mycompany-api\src\Transformers\User.php"

PS I:\work\Github\CI4>

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[paulbalandan]

Heads up: the former usage will become valid in 4.8

[michalsn]

Thank you @datamweb