Convert all comments into "doxygen-ready" comments.

Bug: 36453077
Test: make
Change-Id: Ic77394d4d2e1ccedba3a28230d870c5d6108bd40
diff --git a/tests/baz/1.0/IBase.hal b/tests/baz/1.0/IBase.hal
index d5e3565..97b2db4 100644
--- a/tests/baz/1.0/IBase.hal
+++ b/tests/baz/1.0/IBase.hal
@@ -38,7 +38,7 @@
     };
 
     struct MoreThanOneArrayField {
-        /*
+        /**
          * Generated (Java) code used to redeclare the same variable name
          * multiple times in the same scope, this test ensures that that's no
          * longer the case.