Fix broken links in the Meta tags section

Go to a node edit form → Go to Meta tags → Advanced

• Rating section broken link: most common options
• Section: Used to rate content for audience appropriateness. This tag has little known influence on search engine rankings, but can be used by browsers, browser extensions, and apps. The most common options are general, mature, restricted, 14 years, safe for kids. If you follow the RTA Documentation you should enter RTA-5042-1996-1400-1577-RTA
• metatags.org doesn’t exist anymore so can we link to https://developers.google.com/search/docs/crawling-indexing/special-tags?

• Set cookie section broken link: Sets a cookie
• Section: Sets a cookie on the visitor's browser. Can be in either NAME=VALUE format, or a more verbose format including the path and expiration date; see the link for full details on the syntax.
• metatags.org doesn’t exist anymore so should we link to https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Set-...?

• Expires section broken link: RFC-1123-compliant
• Section: Control when the browser's internal cache of the current page should expire. The date must to be an RFC-1123-compliant date string that is represented in Greenwich Mean Time (GMT), e.g. 'Thu, 01 Sep 2016 00:12:56 GMT'. Set to '0' to stop the page being cached entirely.
• This is an http link: http://www.csgnetwork.com/timerfc1123calc.html, so browser doesn’t load it in https. Is it ok to link to this?

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