docs: add note about when browser.ts was added

Author: FGoessler

content/200-orm/100-prisma-schema/10-overview/03-generators.mdx

@@ -280,6 +280,7 @@ For using types in your frontend aka browser code.
 - Contains no real `PrismaClient`.
 - Contains all model and enum types and values.
 - Provides access to various utilities like `Prisma.JsonNull` and `Prisma.Decimal`.
+- Available since `v6.16.0`.
 
 :::note