Tutorials: Update links to WCAG techniques

### Resource URL

https://www.w3.org/WAI/tutorials/

### Description

Links to related WCAG techniques point to "Techniques for WCAG 2.0" instead of "Techniques for WCAG 2.2".

For example, see https://www.w3.org/WAI/tutorials/menus/#related.

### Resource Shortname

wai-tutorials