[Cookbook][Configuration] documentation of Apache + PHP-FPM

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | all
| Fixed tickets | #3749
Now that we have 3 options, maybe we should have a little table of contents at the top of the article with links to each section and a sentence describing how we'll show you several different options?