Update docs/config/extensions/aptGet.mdx

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: ericallam

docs/config/extensions/aptGet.mdx

@@ -4,7 +4,7 @@ sidebarTitle: "aptGet"
 description: "Use the aptGet build extension to install system packages into the deployed image"
 ---
 
-You can install system packages into the deployed image using using the `aptGet` extension:
+You can install system packages into the deployed image using the `aptGet` extension:
 
 ```ts
 import { defineConfig } from "@trigger.dev/sdk/v3";