docs: revise admin customization pages (#10466)

* docs: revise admin customization pages

* fix prerequisites link

* apply lint

www/apps/book/app/learn/advanced-development/data-models/check-constraints/page.mdx

@@ -29,12 +29,12 @@ export const checks1Highlights = [
 ```ts highlights={checks1Highlights}
 import { model } from "@medusajs/framework/utils"
 
-const CustomProduct = model.define('custom_product', {
+const CustomProduct = model.define("custom_product", {
   // ...
   price: model.bigNumber(),
 })
 .checks([
-  (columns) => `${columns.price} >= 0`
+  (columns) => `${columns.price} >= 0`,
 ])
 ```
 
@@ -53,15 +53,15 @@ export const checks2Highlights = [
 ```ts highlights={checks2Highlights}
 import { model } from "@medusajs/framework/utils"
 
-const CustomProduct = model.define('custom_product', {
+const CustomProduct = model.define("custom_product", {
   // ...
   price: model.bigNumber(),
 })
 .checks([
   {
-    name: 'custom_product_price_check',
-    expression: (columns) => `${columns.price} >= 0`
-  }
+    name: "custom_product_price_check",
+    expression: (columns) => `${columns.price} >= 0`,
+  },
 ])
 ```
 

www/apps/book/app/learn/advanced-development/data-models/relationships/page.mdx

@@ -152,7 +152,7 @@ const Order = model.define("order", {
     mappedBy: "orders",
     pivotTable: "order_product",
     joinColumn: "order_id",
-    inverseJoinColumn: "product_id"
+    inverseJoinColumn: "product_id",
   }),
 })