docs: generate invoice tutorial (#13077)

* docs: generate invoice tutorial

* fix vale error

* add missing icon

* fix sidebar

* update date

www/apps/resources/generated/generated-commerce-modules-sidebar.mjs

@@ -6102,6 +6102,14 @@ const generatedgeneratedCommerceModulesSidebarSidebar = {
               "path": "https://docs.medusajs.com/resources/how-to-tutorials/tutorials/gift-message",
               "children": []
             },
+            {
+              "loaded": true,
+              "isPathHref": true,
+              "type": "ref",
+              "title": "Generate Invoices",
+              "path": "https://docs.medusajs.com/resources/how-to-tutorials/tutorials/invoice-generator",
+              "children": []
+            },
             {
               "loaded": true,
               "isPathHref": true,