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

Co-authored-by: Tsubasa Nagasawa <[email protected]>

Author: SergeyKanzhelev

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

@@ -1779,7 +1779,7 @@ For each of them, fill in the following information by copying the below templat
   - Detection: high number of events indicating TGPS has been exceeded
   - Mitigations: ensure preStop hooks are not delaying termination
   - Diagnostics: Events
-  - Testing: [TBD](https://github.com/kubernetes/kubernetes/blob/b4f902f0371485505ff4eda39975e67bfa9b0727/test/e2e_node/container_lifecycle_test.go#L4272-L4408)
+  - Testing: https://github.com/kubernetes/kubernetes/blob/b4f902f0371485505ff4eda39975e67bfa9b0727/test/e2e_node/container_lifecycle_test.go#L4272-L4408
 - Sidecar container uses a preStop hook that make the container exit during Pod shutdown, sidecar is restarted, leading
 to a CrashLoopBackOff
   - Detection: sidecar in CrashLoopBackOff during termination