Fix typos in comments.

cas/apiv1/options.go

@@ -46,9 +46,9 @@ type Options struct {
 	KeyManager kms.KeyManager `json:"-"`
 
 	// Project, Location, CaPool and GCSBucket are parameters used in CloudCAS
-	// to create a new certificate authority. If a CaPool does not exists it
-	// will be created. GCSBucket is optional, if not provided GCloud will
-	// create a managed bucket.
+	// to create a new certificate authority. If a CaPool does not exist it will
+	// be created. GCSBucket is optional, if not provided GCloud will create a
+	// managed bucket.
 	Project    string `json:"-"`
 	Location   string `json:"-"`
 	CaPool     string `json:"-"`

cas/cloudcas/cloudcas.go

@@ -67,7 +67,7 @@ var revocationCodeMap = map[int]pb.RevocationReason{
 	10: pb.RevocationReason_ATTRIBUTE_AUTHORITY_COMPROMISE,
 }
 
-// caPoolTierMap contains the map between apv1.Options.Tier and the pb type.
+// caPoolTierMap contains the map between apiv1.Options.Tier and the pb type.
 var caPoolTierMap = map[string]pb.CaPool_Tier{
 	"":           pb.CaPool_DEVOPS,
 	"ENTERPRISE": pb.CaPool_ENTERPRISE,