docs: Fix minor typo in security doc Update SECURITY.md

[mdqst]

I noticed a issue in the security documentation where the phrase "assuring the best quality of review" was used.
It seems that the singular "review" doesn’t quite fit the context, as we’re referring to multiple reports being reviewed.

I’ve corrected this to "assuring the best quality reviews," which is more appropriate when discussing the evaluation of multiple reports.

Love you! Based.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[wbnns]

@mdqst Thank you, we're also going to leave this one as-is.