IN-3956 - Middleware extension docs is missing isNamespaced in the example code (#7271)

Co-authored-by: krystian wlodarski <[email protected]>

Author: Olbix

docs/content/3.middleware/2.guides/3.extensions.md

@@ -14,7 +14,7 @@ export const integrations = {
       ...extensions, // don't forget to include existing extensions
       {
         name: 'extension-name',
-        isNamespaced: `[true/false:default]`
+        isNamespaced: `[true/false:default]`,
         extendApiMethods: { /* ... */ },
         extendApp: (app) => { /* ... */ },
         hooks: () => { /* ... */ }
@@ -31,6 +31,7 @@ You can define as many extensions as you want. Each extension has the following
 ```js
 const extension = {
   name: "extension-name",
+  isNamespaced: `[true/false:default]`,
   extendApiMethods: {
     customMethod: (context, params) => {
       /* ... */