You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: api_op_UpdateDocument.go
    path of file: ./repos/aws-sdk-go-v2/service/ssm
    
    the code of the file until where you have to start completion: // Code generated by smithy-go-codegen DO NOT EDIT.

package ssm

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/ssm/types"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// Updates one or more values for an SSM document.
func (c *Client) UpdateDocument(ctx context.Context, params *UpdateDocumentInput, optFns ...func(*Options)) (*UpdateDocumentOutput, error) {
	if params == nil {
		params = &UpdateDocumentInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "UpdateDocument", params, optFns, c.addOperationUpdateDocumentMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*UpdateDocumentOutput)
	out.ResultMetadata = metadata
	return out, nil
}

type UpdateDocumentInput struct {

	// A valid JSON or YAML string.
	//
	// This member is required.
	Content *string

	// The name of the SSM document that you want to update.
	//
	// This member is required.
	Name *string

	// A list of key-value pairs that describe attachments to a version of a document.
	Attachments []types.AttachmentsSource

	// The friendly name of the SSM document that you want to update. This value can
	// differ for each version of the document. If you don't specify a value for this
	// parameter in your request, the existing value is applied to the new document
	// version.
	DisplayName *string

	// Specify the document format for the new document version. Systems Manager
	// supports JSON and YAML documents. JSON is the default format.
	DocumentFormat types.DocumentFormat

	// The version of the document that you want to update. Currently, Systems Manager
	// supports updating only the latest version of the document. You can specify the
	// version number of the latest version or use the $LATEST variable. If you change
	// a document version for a State Manager association, Systems Mana
    
func (c *Client) addOperationUpdateDocumentMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson11_serializeOpUpdateDocument{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson11_deserializeOpUpdateDocument{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "UpdateDocument"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addOpUpdateDocumentValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opUpdateDocument(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	return nil
}