docs: Polish

Signed-off-by: Wish <breezewish@outlook.com>

Author: breezewish

README.md

@@ -159,6 +159,8 @@ If you even don't know what you are designing for, just discuss with **codex** t
 - [Config File](./docs/config.md)
 - [Hooks](./docs/hooks.md)
 
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 ## Other Features
 
 - `--xmodel` (experimental): Use gpt-5.2 first, then use gpt-5.4 to cross review gpt-5.2's work in later rounds. In clear coding tasks this may produce better results than only using gpt-5.2 or gpt-5.4.