This renames some variables for clarity, per the [https://developer.wordpress.org/coding-standards/wordpress-coding-standards/php/#naming-conventions Naming Conventions]:
> Don’t abbreviate variable names unnecessarily; let the code be unambiguous and self-documenting.
* `$out` is renamed to `$output` in various list table methods and admin functions.
* `$sep` is renamed to `$separator` in various list table methods and admin functions.
This affects:
* `WP_Comments_List_Table::handle_row_actions()`
* `WP_List_Table::row_actions()`
* `WP_Media_List_Table::column_default()`
* `WP_MS_Sites_List_Table::site_states()`
* `WP_MS_Users_List_Table::column_blogs()`
* `WP_Terms_List_Table::column_name()`
* `_wp_dashboard_recent_comments_row()`
* `image_align_input_fields()`
* `image_size_input_fields()`
* `wp_doc_link_parse()`
* `_post_states()`
* `_media_states()`
Follow-up to [8653], [8692], [8864], [8910], [8911], [8916], [9103], [9153], [10607], [15491], [17793], [32644], [54070].
Props mukesh27, costdev.
See #56448, #55647.
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