Updated docs to include GCP provider instructions

Signed-off-by: pa250194 <pa250194@ncr.com>

docs/spec/v1alpha1/buckets.md

@@ -11,7 +11,7 @@ Bucket:
 // BucketSpec defines the desired state of an S3 compatible bucket
 type BucketSpec struct {
 	// The S3 compatible storage provider name, default ('generic').
-	// +kubebuilder:validation:Enum=generic;aws;gcp
+	// +kubebuilder:validation:Enum=generic;aws
 	// +optional
 	Provider string `json:"provider,omitempty"`
 
@@ -57,7 +57,6 @@ Supported providers:
 const (
 	GenericBucketProvider string = "generic"
 	AmazonBucketProvider  string = "aws"
-  GoogleBucketProvider  string = "gcp"
 )
 ```