Update deprecation-guide.md

Fixed the wrong tense in API deprecation page #43771.

Author: Rohan Kapse

content/en/docs/reference/using-api/deprecation-guide.md

@@ -35,7 +35,7 @@ The **flowcontrol.apiserver.k8s.io/v1beta2** API version of FlowSchema and Prior
 
 ### v1.27
 
-The **v1.27** release will stop serving the following deprecated API versions:
+The v1.27 release stopped serving the following deprecated API versions(as release has already happened):
 
 #### CSIStorageCapacity {#csistoragecapacity-v127}