Explicitly document required command line arguments

Cobra does not support automatic documentation of positional arguments
(see https://github.com/spf13/cobra/issues/378).

bridge/cmd/guardiand/adminclient.go

@@ -35,7 +35,7 @@ var AdminCmd = &cobra.Command{
 }
 
 var AdminClientInjectGuardianSetUpdateCmd = &cobra.Command{
-	Use:   "governance-vaa-inject",
+	Use:   "governance-vaa-inject [FILENAME]",
 	Short: "Inject and sign a governance VAA from a prototxt file (see docs!)",
 	Run:   runInjectGovernanceVAA,
 	Args:  cobra.ExactArgs(1),

bridge/cmd/guardiand/admintemplate.go

@@ -30,14 +30,14 @@ var TemplateCmd = &cobra.Command{
 }
 
 var AdminClientGuardianSetTemplateCmd = &cobra.Command{
-	Use:   "guardian-set-update",
+	Use:   "guardian-set-update [FILENAME]",
 	Short: "Generate an empty guardian set template at specified path (offline)",
 	Run:   runGuardianSetTemplate,
 	Args:  cobra.ExactArgs(1),
 }
 
 var AdminClientContractUpgradeTemplateCmd = &cobra.Command{
-	Use:   "contract-upgrade",
+	Use:   "contract-upgrade [FILENAME]",
 	Short: "Generate an empty contract upgrade template at specified path (offline)",
 	Run:   runContractUpgradeTemplate,
 	Args:  cobra.ExactArgs(1),

bridge/cmd/guardiand/adminverify.go

@@ -13,7 +13,7 @@ import (
 )
 
 var AdminClientGovernanceVAAVerifyCmd = &cobra.Command{
-	Use:   "governance-vaa-verify",
+	Use:   "governance-vaa-verify [FILENAME]",
 	Short: "Verify governance vaa in prototxt format (offline)",
 	Run:   runGovernanceVAAVerify,
 	Args:  cobra.ExactArgs(1),

bridge/cmd/guardiand/bridgekey.go

@@ -29,7 +29,7 @@ func init() {
 }
 
 var KeygenCmd = &cobra.Command{
-	Use:   "keygen",
+	Use:   "keygen [KEYFILE]",
 	Short: "Create guardian key at the specified path",
 	Run:   runKeygen,
 	Args:  cobra.ExactArgs(1),