Update web-features tags

[mdn-bot]

The output of the tag-web-features script is:

@mdn/[email protected] tag-web-features
node scripts/tag-web-features.js ..

# css.properties.accent-color.transparent
+ web-features:accent-color

# css.types.attr.fallback
+ web-features:attr

# api.Request.Request.options_parameter.body.accepts_readablestream
+ web-features:fetch

# api.Element.requestFullscreen.options_parameter
+ web-features:fullscreen

# css.properties.stop-color.transparent
+ web-features:svg

[github-actions]

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).