Apply suggestions from code review

Signed-off-by: Joe Zhu <[email protected]>

NEWS.md

@@ -5,13 +5,12 @@
  * Added `section_properties_default()` function to define standard portrait properties for tables.
  * Added default theme for `.html` outputs.
  * Added parameter `bold_titles` to `tt_to_flextable()` to bold titles.
+  * Now users can add more than one theme to `tt_to_flextable()`, and/or extend themes.
 
 ### Enhancements
  * Modified `reorder_split_levels()` to cover more edge cases and be more stringent in the allowed inputs.
  * Removed table tree `tt` input from `theme_docx_default()` and added code to handle row classes and number of columns internally.
  * Reworked padding and spacing in default theme `theme_docx_default()`.
- * Now users can add more than one theme to `tt_to_flextable()`, and/or extend themes.
- * Added default theme for `.html` outputs.
  * Added parameter `bold_titles` to `tt_to_flextable()` to bold titles.
 
 ### Bug Fixes