docs: added examples page (#9587)

- Added an examples page with examples of all different concepts in Medusa. We'll probably add more examples with time as we see the need for them.
- Small fixes in different pages.

Preview: https://resources-docs-ocb5uyp0o-medusajs.vercel.app/v2/resources/examples

www/apps/book/app/advanced-development/modules/container/page.mdx

@@ -55,7 +55,7 @@ For example:
 ```ts highlights={[["9"]]}
 import {
   LoaderOptions,
-} from "@medusajs/framework/modules-sdk"
+} from "@medusajs/framework/types"
 import { 
   ContainerRegistrationKeys
 } from "@medusajs/framework/utils"

www/apps/book/app/advanced-development/modules/db-operations/page.mdx

@@ -28,8 +28,8 @@ So, to run database queries in a service:
 For example, in your service, add the following methods:
 
 export const methodsHighlight = [
-  ["4", "getCount", "Retrieves the number of records in `my_custom` using the `count` method."],
-  ["8", "getCountSql", "Retrieves the number of records in `my_custom` using the `execute` method."]
+  ["11", "getCount", "Retrieves the number of records in `my_custom` using the `count` method."],
+  ["18", "getCountSql", "Retrieves the number of records in `my_custom` using the `execute` method."]
 ]
 
 ```ts highlights={methodsHighlight}

www/apps/book/app/advanced-development/modules/options/page.mdx

@@ -81,7 +81,7 @@ For example:
 ```ts title="src/modules/hello/loaders/hello-world.ts" highlights={[["11"], ["12", "ModuleOptions", "The type of expected module options."], ["16"]]}
 import {
   LoaderOptions,
-} from "@medusajs/framework/modules-sdk"
+} from "@medusajs/framework/types"
 
 // recommended to define type in another file
 type ModuleOptions = {