Update language in adjust docs

Cleaning up a bit in advance of this document being linked from the
[Privacy Notice](https://www.mozilla.org/en-US/privacy/firefox/)
as a replacement for the no-longer-existing
https://firefox-source-docs.mozilla.org/mobile/android/adjust.html

docs/adjust.md

@@ -1,6 +1,6 @@
-Firefox Preview tracks certain types of installs using a third-party install tracking framework called Adjust. The intention is to determine the origin of Firefox Preview installs by answering the question, “Did this user on this device install Firefox Preview in response to a specific advertising campaign performed by Mozilla?”
+Firefox for Android tracks certain types of installs using a third-party install tracking framework called Adjust. The intention is to determine the origin of Firefox for Android installs by answering the question, “Did this user on this device install Firefox for Android in response to a specific advertising campaign performed by Mozilla?”
 
-The framework consists of a software development kit (SDK) linked into Firefox Preview and a data-collecting Internet service backend run by the German company [adjust GmbH](https://www.adjust.com). The Adjust SDK is open source and MIT licensed. It is hosted at [https://github.com/adjust/android_sdk](https://github.com/adjust/android_sdk). Firefox Preview pulls in an unmodified copy of the SDK using Gradle. The [Dependencies.kt](https://github.com/mozilla-mobile/fenix/blob/main/buildSrc/src/main/java/Dependencies.kt#L39) contains the version of the framework that is being used. The SDK is documented at [https://docs.adjust.com](https://docs.adjust.com).
+The framework consists of a software development kit (SDK) linked into Firefox for Android and a data-collecting Internet service backend run by the German company [adjust GmbH](https://www.adjust.com). The Adjust SDK is open source and MIT licensed. It is hosted at [https://github.com/adjust/android_sdk](https://github.com/adjust/android_sdk). Firefox for Android pulls in an unmodified copy of the SDK using Gradle. The [Dependencies.kt](https://github.com/mozilla-mobile/fenix/blob/main/buildSrc/src/main/java/Dependencies.kt) contains the version of the framework that is being used. The SDK is documented at [https://docs.adjust.com](https://docs.adjust.com).
 
 ## Adjust Integration