docs(SDB): add documentation on Row-Level Security MTA-5093

Author: SamyOubouaziz

serverless/sql-databases/how-to/use-row-level-security.md renamed to serverless/sql-databases/how-to/use-row-level-security.mdx

@@ -13,8 +13,10 @@ categories:
   - serverless
 ---
 
-Row Level Security can be actived with Serverless SQL Database for a maximum 2 different roles having both read and write permissions. This can be useful to restrict access to subset of users with frameworks or tools such as [PostgREST](https://docs.postgrest.org/en/v12/).
-This requires setting up different [IAM permissions sets](https://www.scaleway.com/en/docs/identity-and-access-management/iam/reference-content/permission-sets/) for each role (**ServerlessSQLDatabaseFullAccess** or **ServerlessSQLDatabaseReadWrite** for one role, and **ServerlessSQLDatabaseDataReadWrite** for the other).
+Row-Level Security is a database security mechanism that allows access only to specific rows of a table to a user.
+
+Row Level Security can be actived with Serverless SQL Database for a maximum 2 different roles having both read and write permissions. This can be used to restrict access to a subset of users with frameworks or tools such as [PostgREST](https://docs.postgrest.org/en/v12/).
+This requires setting up different [IAM permissions sets](/identity-and-access-management/iam/reference-content/permission-sets/) for each role (**ServerlessSQLDatabaseFullAccess** or **ServerlessSQLDatabaseReadWrite** for one role, and **ServerlessSQLDatabaseDataReadWrite** for the other).
 
 <Macro id="requirements" />
 
@@ -25,7 +27,7 @@ This requires setting up different [IAM permissions sets](https://www.scaleway.c
 
 ## Add sample data and create PostgreSQL Row Level Security
 
-1. [Connect to your Serverless SQL Database](https://www.scaleway.com/en/docs/serverless/sql-databases/quickstart/#how-to-connect-to-a-database) with a PostgreSQL client. For instance with psql:
+1. [Connect to your Serverless SQL Database](/serverless/sql-databases/quickstart/#how-to-connect-to-a-database) with a PostgreSQL client such as `psql`:
     ```bash
     psql "postgres://[user-or-application-id]:[api-secret-key]@[database-hostname]:5432/[database-name]?sslmode=require"
     ```