assembleDebug -> assembleRelease

Bug: 186569865
Test: ./gradlew buildOnServer -m | grep assembleDebug # and see there are only two matches:

    :lifecycle:lifecycle-viewmodel-savedstate:assembleDebug SKIPPED
    :navigation:navigation-common:assembleDebug SKIPPED

Test: Treehugger runs busytown/*.sh

Change-Id: I59ad7d18b30c684a951f341412c6f6ba6152ec4d

diff --git a/cleanBuild.sh b/cleanBuild.sh
index c6ed4dd..5b330b9 100755
--- a/cleanBuild.sh
+++ b/cleanBuild.sh

@@ -17,7 +17,7 @@
   echo
   echo "For example:"
   echo
-  echo "  $0 assembleDebug # or any other arguments you would normally give to ./gradlew"
+  echo "  $0 assembleRelease # or any other arguments you would normally give to ./gradlew"
   echo
   echo
   echo "-y"