Fix URL typo for PowerVS image (#638)

Author: mkumatag

docs/book/src/machine-images/powervs.md

@@ -7,5 +7,5 @@
 | us-south | power-oss-bucket | [capibm-powervs-centos-streams8-1-22-4.ova.gz][streams8-1-22-4] | 1.22.4             |
 
 
-[streams8-1-23-3]: https://power-oss-bucket.s3.us-south.cloud-object-storage.appdomain.cloud/capibm-powervs-centos-streams8-1-23-5.ova.gz
+[streams8-1-23-5]: https://power-oss-bucket.s3.us-south.cloud-object-storage.appdomain.cloud/capibm-powervs-centos-streams8-1-23-5.ova.gz
 [streams8-1-22-4]: https://power-oss-bucket.s3.us-south.cloud-object-storage.appdomain.cloud/capibm-powervs-centos-streams8-1-22-4.ova.gz