Backtick-escape three sets of HTML entities used in DocBlock descriptions in wp-includes/kses.php.

Without the escaping, the Code Reference/browser may inadvertently attempt to convert and display entities.

Fixes #30473.

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git-svn-id: http://core.svn.wordpress.org/trunk@30710 1a063a9b-81f0-0310-95a4-ce76da25c4cd