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/troubleshooting/transaction-error-in-checkout.md

@@ -19,7 +19,7 @@ Then in your `medusa-config.js`, you should change the project configuration to
 ```jsx title=medusa-config.js
 module.exports = {
   projectConfig: {
-    //...
+    // ...
     database_url: DATABASE_URL,
     database_type: "postgres",
   },
@@ -31,6 +31,8 @@ Where `DATABASE_URL` is the connection string to your PostgreSQL database. You c
 
 Make sure to also remove the following lines that are used to configure an SQLite database:
 
+<!-- eslint-skip -->
+
 ```jsx title=medusa-config.js
 database_type: "sqlite",
 database_database: "./medusa-db.sql",