Improve various `@param` docs.

See #30224.

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Allow square brackets in a URL when it's sanitised for a redirect. Square brackets are valid in query parameters and IPv6 addresses.

Fixes #17052
Props voldemortensen

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Allow brackets in a URL when it's sanitised for a redirect. Brackets are valid in query parameters.

Fixes #30308
Props voldemortensen

Built from https://develop.svn.wordpress.org/trunk@30684


git-svn-id: http://core.svn.wordpress.org/trunk@30674 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clarify the text for the 'Edit Selection' link when multiple media items are selected in the media manager.

Props adamsilverstein
See #24325

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Remove the sortable functionality from the selection editing toolbar at the bottom of the media manager.

Fixes #29934
See #24352
Props jessepollak

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Unit Tests: The `assertEqualSets()` helper was returning true for some sets that were not equal. `assertEqualSets()` now behaves correctly, and the new `assertEqualSetsWithIndex()` helper also checks that the array indexes are the same.

Fixes #30522.

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