Add comments for offline-sdk-referenceonly docs

Add comment to provide some cautions in case of we make some changes on
the doc target names in the future.

Test: N/A
Bug: b/116221385
Change-Id: Ibb21ca51c1eed990fe5dfceb6a8170821e70f8cf
diff --git a/Android.bp b/Android.bp
index b2b3dff..678b5da 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1267,6 +1267,9 @@
 }
 
 droiddoc {
+    // Please sync with android-api-council@ before making any changes for the name property below.
+    // Since there's cron jobs that fetch offline-sdk-referenceonly-docs-docs.zip periodically.
+    // See b/116221385 for reference.
     name: "offline-sdk-referenceonly-docs",
     defaults: ["framework-docs-default"],
     srcs: [
@@ -1283,6 +1286,9 @@
 }
 
 droiddoc {
+    // Please sync with android-api-council@ before making any changes for the name property below.
+    // Since there's cron jobs that fetch offline-system-sdk-referenceonly-docs-docs.zip periodically.
+    // See b/116221385 for reference.
     name: "offline-system-sdk-referenceonly-docs",
     defaults: ["framework-docs-default"],
     srcs: [