Fix comment in cleanBuild.sh

Test: ./cleanBuild.sh buildOnServer

Change-Id: I500f9f898ed13de6754dc20ea711f2fb8b8fb34b

diff --git a/cleanBuild.sh b/cleanBuild.sh
index 81d3275..a7887ce 100755
--- a/cleanBuild.sh
+++ b/cleanBuild.sh

@@ -67,7 +67,7 @@
   rm -rf .gradle
   rm -rf buildSrc/.gradle
   rm -f local.properties
-  // AGP should (also) do this automatically (b/170640263)
+  # AGP should (also) do this automatically (b/170640263)
   rm -rf appsearch/appsearch/.cxx
   rm -rf appsearch/local-backend/.cxx
   rm -rf $OUT_DIR