Update index.mdx (#20895)

Author: thomasgauvin

src/content/docs/workers/tutorials/postgres/index.mdx

@@ -103,14 +103,10 @@ npx wrangler secret put DB_URL
 
 Set your `DB_URL` secret locally in a `.dev.vars` file as documented in [Local Development with Secrets](/workers/configuration/secrets/).
 
-<WranglerConfig>
-
-```toml
+```toml title='.dev.vars'
 DB_URL="<ENTER YOUR POSTGRESQL CONNECTION STRING>"
 ```
 
-</WranglerConfig>
-
 ### Set explicit parameters
 
 Configure each database parameter as an [environment variable](/workers/configuration/environment-variables/) via the [Cloudflare dashboard](/workers/configuration/environment-variables/#add-environment-variables-via-the-dashboard) or in your Wrangler file. Refer to an example of aWrangler file configuration:
@@ -379,4 +375,4 @@ Your Worker application is now live and accessible at `<YOUR_WORKER>.<YOUR_SUBDO
 
 To build more with databases and Workers, refer to [Tutorials](/workers/tutorials) and explore the [Databases documentation](/workers/databases).
 
-If you have any questions, need assistance, or would like to share your project, join the Cloudflare Developer community on [Discord](https://discord.cloudflare.com) to connect with fellow developers and the Cloudflare team.
+If you have any questions, need assistance, or would like to share your project, join the Cloudflare Developer community on [Discord](https://discord.cloudflare.com) to connect with fellow developers and the Cloudflare team.