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These H5 (heading level 5) don't allow for a good headings hierarchy and shouldn't be headings in the first place. Each group of options has now its own fieldset and legend. In `render_screen_options()`, introduce two new "render" methods: `render_meta_boxes_preferences()` and `render_list_table_columns_preferences()` for consistency with already existing render methods and cleaner code. Props joedolson, afercia. Fixes #33646. Built from https://develop.svn.wordpress.org/trunk@34991 git-svn-id: http://core.svn.wordpress.org/trunk@34956 1a063a9b-81f0-0310-95a4-ce76da25c4cd