Add braces missed while adding docs for the `option_page_capability_{$option_page}` hook.

See [25372]. See #25229.

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Switch to SSL for the Flickr and Slideshare oEmbed endpoints. Add support for SSL embeds on flic.kr. See #28507.
Built from https://develop.svn.wordpress.org/trunk@28834


git-svn-id: http://core.svn.wordpress.org/trunk@28638 1a063a9b-81f0-0310-95a4-ce76da25c4cd