Update app_preface.md

app_preface.md

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 # 'da SCAMTEXT engine
-This app is a demo for `scamtext` engine ([original repo (in Korean)](https://github.com/fgenie/scamtext)) which is random forest of regex classifiers built with GPT-4 prompting. 
+This app is a demo for `scamtext` engine ([original repo (in Korean)](https://github.com/fgenie/scamtext)) which is random forest of regex classifiers built with prompting GPT-4. 
 
 ## Design
-It is first inspired by the concept of [random forest](https://www.youtube.com/watch?v=J4Wdy0Wc_xQ), while the actual prompting method rather resembles [PAL](https://arxiv.org/abs/2211.10435) and [Self-consistency](https://arxiv.org/abs/2203.11171). <br/>
+It is first inspired by the concept of [random forest](https://www.youtube.com/watch?v=J4Wdy0Wc_xQ), 
+while the actual prompting method rather resembles [PAL](https://arxiv.org/abs/2211.10435) and [Self-consistency](https://arxiv.org/abs/2203.11171).   
+
 You can find exact prompt I've used at [here](https://github.com/fgenie/scamtext/blob/main/prompting_test/coldstart.yaml).
 
 ## Motivation