Update compilerdump.md with info on resource files

Since these will be passed (flag guarded) from the next version of AGP
we should explicitly call this out

Change-Id: Idf1938475682a64d0ab61b23c3fc817ff769fe58
diff --git a/doc/compilerdump.md b/doc/compilerdump.md
index 7bffd27..c85a9ff 100644
--- a/doc/compilerdump.md
+++ b/doc/compilerdump.md
@@ -9,13 +9,16 @@
 The dump contains almost all of the inputs that are given to the compiler as
 part of compilation. In particular, it contains *all* class definitions in the
 form of Java classfiles (i.e., bytecode, not the Java source files).
+If resource shrinking is enabled, the dump also contains *all* resources (i.e.,
+the manifest, all res folder entries in proto and raw format, and any other
+file flowing into resource shrinking).
 In addition to the classfiles, the dump also includes Java resources, the
 compiler type, version, and flags, such as `--debug` or `--release`,
 main-dex lists or rules, and more. For R8 the dump also contains the full
 concatenation of all keep rules.
 
 The dump is a zip file containing the above. You should unzip it and review
-the content locally. The program, classpath and library content will be in
+the content locally. The program, classpath, library and resource content will be in
 nested zip files. The remaining content is in plain text files.