docs: use Request::is() instead of getMethod()

[kenjis]

Description
Follow-up #6995

• use Request::is() instead of getMethod()

Checklist:

• Securely signed commits
• [] Component(s) with PHPDoc blocks, only if necessary or adds value
• [] Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[lonnieezell]

I guess I missed when that method was created. That's an unfortunate name since I think it's checking the URI, not the method, but since that's what the method is called, these changes look fine.

[kenjis]

Request::is() checks the type of a request.
https://codeigniter.com/user_guide/incoming/incomingrequest.html#is

It is already overridden by CodeIgniter HTMX.
https://michalsn.github.io/codeigniter-htmx/incoming_request/#is

[lonnieezell]

I wasn't suggesting we change it now. Just bummed I missed that discussion. No worries. :)

[samsonasik]

Thank you @kenjis