Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: shiyuhang0

internal/cli/serverless/changefeed/edit.go

@@ -82,7 +82,7 @@ func EditCmd(h *internal.Helper) *cobra.Command {
 		Example: fmt.Sprintf(`  Update a changefeed in interactive mode:
   $ %[1]s serverless changefeed edit
 
-  Update the name, kafka, and filter of a changefeed in non-interactive mode:x
+  Update the name, kafka, and filter of a changefeed in non-interactive mode:
   $ %[1]s serverless changefeed edit -c <cluster-id> --changefeed-id <changefeed-id> --name newname --kafka <full-specified-kafka> --filter <full-specified-filter>
 `, config.CliName),
 		PreRunE: func(cmd *cobra.Command, args []string) error {