Sergey Biryukov 2294d65753 Docs: Synchronize @return descriptions for ::handle_row_actions() methods in list tables.
Make sure `WP_Comments_List_Table::handle_row_actions()` and `WP_MS_Sites_List_Table::handle_row_actions()` return a string, for consistency with other classes.

See #49170, #48303.
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