Add missing anchor ID to assembly

Author: maxwelldb

storage/container_storage_interface/persistent-storage-csi-google-cloud-file.adoc

@@ -24,6 +24,7 @@ To create CSI-provisioned PVs that mount to {gcp-short} Filestore Storage assets
 
 include::modules/persistent-storage-csi-about.adoc[leveloffset=+1]
 
+[id="installing-the-gcp-filestore-csi-driver-operator"]
 == Installing the {gcp-short} Filestore CSI Driver Operator
 
 include::modules/persistent-storage-csi-gcp-filestore-wif.adoc[leveloffset=+2]