summarize function signatures (coderabbitai#388)

<!-- This is an auto-generated comment: release notes by openai -->
### Summary by OpenAI

```
### Refactor:
- Updated function signatures in `src/prompts.ts` for better clarity and consistency.
- Improved control structures for enhanced logic flow.
- Optimized variable assignments for efficient memory usage.

```

> Here's to the code that's now more clear, 🥂
>
> With logic refined and an interface so dear. 💻
>
> Variables assigned with a thoughtful mind, 🧠
>
> In this PR, efficiency you'll find. 🚀
<!-- end of auto-generated comment: release notes by openai -->

src/prompts.ts

@@ -22,9 +22,11 @@ $file_diff
 
 ## Instructions
 
-I would like you to summarize the diff within 100 words by noting the
-changes made to the function signatures, control structures, and
-variable assignments.
+I would like you to succinctly summarize the diff within 100 words.
+If applicable, your summary should include a note about alterations 
+to the signatures of exported functions, global data structures and 
+variables, and any changes that might affect the external interface or 
+behavior of the code.
 `
   triageFileDiff = `Below the summary, I would also like you to triage the diff as \`NEEDS_REVIEW\` or 
 \`APPROVED\` based on the following criteria: