chore(docs): added eslint to lint documentation code blocks (#2920)

* docs: added rule for code length

* chore: fixes based on vale errors

* changed to use eslint

* fixes using eslint

* added github action for documentation eslint

* changed allowed max-length

* fixed incorrect heading level

* removed comment

docs/content/js-client/overview.md

@@ -37,9 +37,9 @@ import Medusa from "@medusajs/medusa-js"
 
 const medusa = new Medusa()
 
-//use method
+// use method
 medusa.customers.create({
-  //data
+  // data
 })
 ```
 
@@ -47,7 +47,7 @@ The `customers` resource also has another resource `addresses` nested inside it
 
 ```js
 medusa.customers.addresses.addAddress({
-  //data
+  // data
 })
 ```