wordpress created in k8s but reported an database connection error.

In addition to modifying the mirror version, I followed the description of the document, but when I visited the site, I reported Database Connection Failed.

the env:
-- mysql:8.0
-- wordpress:latest

I found we should create `wordpress` database in MySQL first then we can visit the wordpress site normally.
That, the doc doesn't mention.

Review the documentation for the WordPress and MySQL deployment described in this issue, including the mirror-version instructions. Add the missing requirement to create the `wordpress` database in MySQL, then verify that the documented setup explains how to reach the WordPress site without the database connection error.

Written by the indexing model from the issue text.