add anchor for testplan

Signed-off-by: kerthcet <[email protected]>

Author: kerthcet

keps/sig-scheduling/3094-pod-topology-spread-considering-taints/README.md

@@ -401,7 +401,7 @@ in back-to-back releases.
 -->
 #### Alpha
 - Feature implemented behind feature gate.
-- Unit and integration tests passed as designed in [TestPlan](###TestPlan).
+- Unit and integration tests passed as designed in [TestPlan](#test-plan).
 
 #### Beta
 - Feature is enabled by default