Update prisma.mdx

Renames the falsely named property "directURL" to "directUrl"

apps/docs/pages/guides/integrations/prisma.mdx

@@ -173,7 +173,7 @@ Update your Prisma schema by setting the `directUrl` in the datasource block:
 datasource db {
   provider          = "postgresql"
   url               = env("DATABASE_URL")
-  directURL         = env("DIRECT_URL")
+  directUrl         = env("DIRECT_URL")
   shadowDatabaseUrl = env("SHADOW_DATABASE_URL")
 }
 ```