SJIP: Clarify how to determine if the protocol role is trusted

[WangSecurity]

Description

This SJIP clarifies how to determine if the protocol role is trusted or not. Additionally, clarifies that admins are assumed to behave correctly and not harm the protocol/users.

Judging Guidelines PR

https://github.com/sherlock-protocol/sherlock-v2-docs/pull/57/files

Rationale

In one of the recent contests, Watsons claimed the specific role to be untrusted because it wasn't mentioned in the contest README, while the owner and admin roles were mentioned. Additionally, this change is to make the guideline easier for understanding of new Watsons coming to Sherlock, and makes the guideline easier to use for the Lead Judge to explain their decision.

Relevant Issue Discussions

Relevant discussion is on a private report.