chore: Add fkatsuhiro as code owner for the docs directory - #2690

Changed pages include:

• index.html - view
• 404.html - view
• analytics.html - view
• auto-icons.html - view
• blog.html - view
• examples.html - view
• i18n.html - view
• is-background.html - view
• runner.html - view
• storage.html - view

There are more changes not included in the list