{Documentation} Companion App - fix v275 APK download links

Summary:
D112646824 bumped the Aria Companion App Android APK download links to v275 but pointed them at the wrong host (the foreign-service S3 bucket). This updates both the 64-bit (ARM64) and 32-bit (ARMV7) v275 APK links on the Get Started page to the canonical projectaria.com download endpoint.

___

Differential Revision: D112661778

fbshipit-source-id: a31dd61814ec24cf4541c2f79c3f985def049e29

Author: yzouyzouyzou

website/docs-ark/companion-app/start.mdx

@@ -60,8 +60,8 @@ to open the [Aria Testflight invitation](https://testflight.apple.com/join/G9sm5
 ### Download and install
 Follow one of these links on your Android device to download the app:
 
-Mobile Companion App APK v275 - [recommended (64-bit architecture)](https://foreign-service-public-assets.s3.us-west-2.amazonaws.com/apps/android/Aria_v275_ARM64.apk)
-Mobile Companion App APK v275 - [for 32-bit architecture](https://foreign-service-public-assets.s3.us-west-2.amazonaws.com/apps/android/Aria_v275_ARMV7.apk)
+Mobile Companion App APK v275 - [recommended (64-bit architecture)](https://www.projectaria.com/async/sample/download/?bucket=build&filename=Aria_v275_ARM64.apk)
+Mobile Companion App APK v275 - [for 32-bit architecture](https://www.projectaria.com/async/sample/download/?bucket=build&filename=Aria_v275_ARMV7.apk)
 
 To update the app, download and install the latest version.