Update wording around side channels in readme

Change-Id: I210b35fb31e351efe27045433240c8f35ff58393

README.md

@@ -276,10 +276,10 @@ over time.
 [Side-channel attacks](https://en.wikipedia.org/wiki/Side-channel_attack)
 present significant challenges for confidential computing environments. We
 acknowledge that most existing TEEs have compromises and may be vulnerable to
-various kinds of side-channel attacks. This is an active research area, both
-hardware and software innovations are needed to defend against such attacks.
-Service providers hosting the TEE based servers need to implement strong host
-security. Strong security requires
+some side-channel attacks. This is an active research area, both hardware and
+software innovations are needed to defend fully against such attacks. Service
+providers hosting the TEE based servers need to implement strong host security.
+Strong security requires
 [defense in depth](<https://en.wikipedia.org/wiki/Defense_in_depth_(computing)>).
 
 Attacks that require physical access to the server hardware is another class of