Administration: A11y: Clarify settings in discussion options.

Fix several settings groups in the discussion options that were written in a compound/sentence structure format. These formats are difficult to parse for screen reader users and have significant layout problems in mobile viewports.

Change settings to use independent labeling.

Props Cheffheid, anthakkar08, DrewAPicture, afercia, jwgoedert, sannevndrmeulen, sudipatel007, tirth03, joedolson.
See #31354.
Built from https://develop.svn.wordpress.org/trunk@59160


git-svn-id: http://core.svn.wordpress.org/trunk@58555 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/edit-rtl.css

@@ -1298,7 +1298,7 @@ div.tabs-panel-active:focus {
 	/* Only visible in Windows High Contrast mode */
 	outline: 2px solid transparent;
 }
-
+.options-discussion-php .indent-children ul,
 #front-page-warning,
 #front-static-pages ul,
 ul.export-filters,

wp-admin/css/edit.css

@@ -1297,7 +1297,7 @@ div.tabs-panel-active:focus {
 	/* Only visible in Windows High Contrast mode */
 	outline: 2px solid transparent;
 }
-
+.options-discussion-php .indent-children ul,
 #front-page-warning,
 #front-static-pages ul,
 ul.export-filters,