Document no-strip flag

Test: m
Change-Id: I69a7e5c1d51089f01557428174779a68eb37ae7e
diff --git a/build/Android.bp b/build/Android.bp
index 0034af7..d1026ca 100644
--- a/build/Android.bp
+++ b/build/Android.bp
@@ -165,6 +165,8 @@
                 "bionic_libc_platform_headers",
             ],
             strip: {
+                // Do not strip art libs when building for linux-bionic.
+                // Otherwise we can't get any symbols out of crashes.
                 none: true,
             },
         },