Restore stringer-generated files back to new version

stringer has changed the boilerplate it generates in a recent version.
We'd previously updated to the new format but accientally rolled back
to the old while merging a long-running feature branch.

This restores us back to the new format again.

backend/local/counthookaction_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=countHookAction hook_count_action.go"; DO NOT EDIT
+// Code generated by "stringer -type=countHookAction hook_count_action.go"; DO NOT EDIT.
 
 package local
 

backend/operationtype_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=OperationType operation_type.go"; DO NOT EDIT
+// Code generated by "stringer -type=OperationType operation_type.go"; DO NOT EDIT.
 
 package backend
 

command/counthookaction_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=countHookAction hook_count_action.go"; DO NOT EDIT
+// Code generated by "stringer -type=countHookAction hook_count_action.go"; DO NOT EDIT.
 
 package command
 

command/internal_plugin_list.go

@@ -126,8 +126,8 @@ var InternalProviders = map[string]plugin.ProviderFunc{
 	"nomad":        nomadprovider.Provider,
 	"ns1":          ns1provider.Provider,
 	"null":         nullprovider.Provider,
-	"opc":          opcprovider.Provider,
 	"oneandone":    oneandoneprovider.Provider,
+	"opc":          opcprovider.Provider,
 	"openstack":    openstackprovider.Provider,
 	"opsgenie":     opsgenieprovider.Provider,
 	"packet":       packetprovider.Provider,

config/resource_mode_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=ResourceMode -output=resource_mode_string.go resource_mode.go"; DO NOT EDIT
+// Code generated by "stringer -type=ResourceMode -output=resource_mode_string.go resource_mode.go"; DO NOT EDIT.
 
 package config
 

helper/schema/getsource_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=getSource resource_data_get_source.go"; DO NOT EDIT
+// Code generated by "stringer -type=getSource resource_data_get_source.go"; DO NOT EDIT.
 
 package schema
 

helper/schema/valuetype_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=ValueType valuetype.go"; DO NOT EDIT
+// Code generated by "stringer -type=ValueType valuetype.go"; DO NOT EDIT.
 
 package schema
 

terraform/graphtype_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=GraphType context_graph_type.go"; DO NOT EDIT
+// Code generated by "stringer -type=GraphType context_graph_type.go"; DO NOT EDIT.
 
 package terraform
 

terraform/instancetype_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=InstanceType instancetype.go"; DO NOT EDIT
+// Code generated by "stringer -type=InstanceType instancetype.go"; DO NOT EDIT.
 
 package terraform
 

terraform/walkoperation_string.go

@@ -1,4 +1,4 @@
-// Code generated by "stringer -type=walkOperation graph_walk_operation.go"; DO NOT EDIT
+// Code generated by "stringer -type=walkOperation graph_walk_operation.go"; DO NOT EDIT.
 
 package terraform