Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for
reference.

Bug: 162536543
Test: m
Change-Id: I30ca0bf2f77015637a0f36a7083f4044cd29d3b1
diff --git a/tests/RollbackTest/README.txt b/tests/RollbackTest/README.txt
index c0b718a..bc3b3bc 100644
--- a/tests/RollbackTest/README.txt
+++ b/tests/RollbackTest/README.txt
@@ -9,10 +9,10 @@
   - device driven test for staged rollbacks.
 
 TestApp
-  - source for dummy apks used in testing.
+  - source for fake apks used in testing.
 
 TestApex
-  - source for dummy apex modules used in testing.
+  - source for fake apex modules used in testing.
 
 Running the tests
 =================