Update documentation for compiledump

Include flag to turn off Gradle build cache. Using the build cache can
result in build avoidance of the compiler invocation.

Change-Id: I7b1c3f6fefb2ab6f90b1e06c1c4a82d3b8807c46
diff --git a/doc/compilerdump.md b/doc/compilerdump.md
index 2db569a..7bffd27 100644
--- a/doc/compilerdump.md
+++ b/doc/compilerdump.md
@@ -47,7 +47,7 @@
 build-target command. Say your build target is `assembleRelease`, you would run:
 
 ```
-./gradlew assembleRelease -Dcom.android.tools.r8.dumpinputtofile=mydump.zip --no-daemon
+./gradlew assembleRelease -Dorg.gradle.caching=false -Dcom.android.tools.r8.dumpinputtofile=mydump.zip --no-daemon
 ```
 
 If the build is a debug build, such as `assembleDebug`, then it will likely be an
@@ -57,7 +57,7 @@
 hopefully be the last dump):
 
 ```
-./gradlew assembleDebug -Dcom.android.tools.r8.dumpinputtodirectory=mydumps/ --no-daemon
+./gradlew assembleDebug -Dorg.gradle.caching=false -Dcom.android.tools.r8.dumpinputtodirectory=mydumps/ --no-daemon
 ```