BZ2049854: Correct GCP CSI Driver in table to GA

Author: Lisa Pettyjohn

modules/persistent-storage-csi-drivers-supported.adoc

@@ -18,7 +18,7 @@ The following table describes the CSI drivers that are installed with {product-t
 
 |AWS EBS | ✅ | - | ✅
 |AWS EFS (Tech Preview) | - | - | -
-|Google Cloud Platform (GCP) persistent disk (PD) (Tech Preview)| ✅ | - | ✅
+|Google Cloud Platform (GCP) persistent disk (PD)| ✅ | - | ✅
 |Microsoft Azure Disk | ✅ | ✅ | ✅
 |Microsoft Azure Stack Hub | ✅ | ✅ | ✅
 |OpenStack Cinder | ✅ | ✅ | ✅