docs: add ios16.4 to the documented baseline-widely-available target - #22600

Changed pages include:

• index.html - view
• 404.html - view
• acknowledgements.html - view
• blog.html - view
• changes/index.html - view
• config/index.html - view
• guide/index.html - view
• live.html - view
• plugins/index.html - view
• releases.html - view

There are more changes not included in the list