ref(autofix): Use a colon instead of an em dash in PR command hints (#123059)

let's not use emdashes for customer-facing text, it sounds/looks too
sloppy

changing manual pr iteration hints in PR descriptions.

before:
<img width="339" height="68" alt="image"
src="https://github.com/user-attachments/assets/f69fb2aa-5400-402a-9de9-edc3e155614c"
/>

after:
<img width="318" height="56" alt="image"
src="https://github.com/user-attachments/assets/9e1dae03-934c-477d-a7b4-47b6210f2d0b"
/>