docs: fix broken playground links in scoped slots examples - #3442

Changed pages include:

• index.html - view
• 404.html - view
• api/index.html - view
• error-reference/index.html - view
• examples/index.html - view
• glossary/index.html - view
• partners/index.html - view
• sponsor/index.html - view
• style-guide/index.html - view
• translations/index.html - view

There are more changes not included in the list