Update androidx documentation with latest supported API levels for device testing in FTL.

PiperOrigin-RevId: 718061945
Change-Id: I14600ecd25076e6f7723a405d569dc4bd70a1b55
diff --git a/docs/testing.md b/docs/testing.md
index b5b031f..95ae6b4 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -27,14 +27,13 @@
 pre-release API level.
 
 In practice, this is limited by device and emulator availability and
-reliability. As of November 2023, we run tests on the following API levels:
+reliability. As of January 2025, we run tests on the following API levels:
 
 -   API level 21: the lowest API level supported by Firebase Test Lab (FTL)
 -   API level 26: the lowest supported ARM-based emulator FTL runner, which has
     much greater performance and stability
--   API level 28: provides coverage between 26 and 30
--   API levels 30, 31, 33: the latest supported API levels, which represent the
-    majority of devices in the field
+-   API levels 30, 33, 34, 35: the latest supported API levels, which represent
+    the majority of devices in the field
 
 ## Adding tests {#adding}
 
@@ -433,9 +432,10 @@
 # Run instrumentation tests in Firebase Test Lab (remote)
 ./gradlew <project-name>:ftlnexus4api21
 ./gradlew <project-name>:ftlpixel2api26
-./gradlew <project-name>:ftlpixel2api28
 ./gradlew <project-name>:ftlpixel2api30
 ./gradlew <project-name>:ftlpixel2api33
+./gradlew <project-name>:ftlmediumphoneapi34
+./gradlew <project-name>:ftlmediumphoneapi35
 
 # Run local unit tests
 ./gradlew <project-name>:test