[Doc] Update cert expire time to 1 year

Author: praveenkumar

docs/source/topics/proc_troubleshooting-expired-certificates.adoc

@@ -1,7 +1,7 @@
 [id="troubleshooting-expired-certificates_{context}"]
 = Troubleshooting expired certificates
 
-The system bundle in each released [command]`{bin}` executable expires 30 days after the release.
+The system bundle of {ocp} in each released [command]`{bin}` executable expires 1 year after the release.
 This expiration is due to certificates embedded in the {ocp} cluster.
 The [command]`{bin} start` command triggers an automatic certificate renewal process when needed.
 Certificate renewal can add up to five minutes to the start time of the cluster.