Improve clarity in Proof of Cloud documentation

Clarified the description of the Proof of Cloud framework and its public registry.

Author: nuhgid

docs/05-tee-vulnerabilities/04-mitigations.md

@@ -6,9 +6,10 @@ sidebar_label: Mitigations
 
 ## Proof of Cloud
 
-A defence-in-depth framework to verify the integrity of physical infrastructure that hosts the TEE.
+A defence-in-depth framework to verify the integrity of physical infrastructure that hosts a TEE.
+
 Proof of Cloud utilizes 3 levels of verification (Human-Assisted, Automated, and Continuous Monitoring) to prove that workloads only execute in legitimate data centers with no unauthorized physical access.
 
-A public registry of cloud-hosted server hardware identities allows anyone to verify that any hardware is included in the registry.
+A public registry of cloud-hosted server hardware identities allows anyone to confirm that the servers have not been physically compromised, signed off by multiple independent organizations.
 
 Learn more about Proof of Cloud and join the alliance [here](https://proofofcloud.org/).