docs: use site_url()
docs: use site_url()

Encourage using site_url() since we have so many issues with URLs in subfolders.

Co-authored-by: MGatner <4a0d3a0011db414b637358ca82d0ecb3ee374b16@icloud.com>
lonnieezell/CodeIgniter4,bcit-ci/CodeIgniter4,natanfelles/CodeIgniter4,bcit-ci/CodeIgniter4,kenjis/CodeIgniter4,lonnieezell/CodeIgniter4,ytetsuro/CodeIgniter4,bcit-ci/CodeIgniter4,ytetsuro/CodeIgniter4,bcit-ci/CodeIgniter4,samsonasik/CodeIgniter4,lonnieezell/CodeIgniter4,kenjis/CodeIgniter4,lonnieezell/CodeIgniter4,ytetsuro/CodeIgniter4,samsonasik/CodeIgniter4,bcit-ci/CodeIgniter4,lonnieezell/CodeIgniter4,kenjis/CodeIgniter4,samsonasik/CodeIgniter4,samsonasik/CodeIgniter4,ytetsuro/CodeIgniter4,natanfelles/CodeIgniter4,natanfelles/CodeIgniter4,natanfelles/CodeIgniter4,samsonasik/CodeIgniter4,samsonasik/CodeIgniter4,ytetsuro/CodeIgniter4,ytetsuro/CodeIgniter4,kenjis/CodeIgniter4,kenjis/CodeIgniter4,lonnieezell/CodeIgniter4,natanfelles/CodeIgniter4,natanfelles/CodeIgniter4