Problem: scope in PR name is not mentioned as optional

[angelicawill]

This part of the guideline is confusing:

### Before Submitting, Ask  
1. Does it use `type(scope): action` format?  

@dante4rt the scope is optional (<type>[optional scope]: <description>), do you have any other comments?
Please don't reject PRs when things are optional. Reject only when there is an objective problem.

Originally posted by @zolotokrylin in https://github.com/holdex/marketing-website/issues/864#issuecomment-3585039257

Solution

Extend guidelines