Apply suggestions from code review

Co-authored-by: Todd Neal <todd@tneal.org>

keps/sig-node/753-sidecar-containers/README.md

@@ -1107,8 +1107,8 @@ The additional benefits of this approach comparing to initial proposal:
 
 ### Restarting sidecar containers during Pod termination
 
-Sidecar containers should be restarted when a Pod is terminated to ensure that they
-are running while the main containers are running. This feature was originally planned
+Sidecar containers should be restarted if they exit prematurely when a Pod is terminated to ensure that they
+are running while the containers that should terminate prior to its termination are still running. This feature was originally planned
 for beta release, but after further analysis, we decided to postpone it and introduce a 
 separate feature gate for it.