Update error message for desugared library version

Include the link to the developer.android.com section
with information on which compiler version supports which
desugared library version.

Fixes: b/235325369
Change-Id: I9b606b7b5229e7937526c828ff3b19159c2f02a0
diff --git a/src/main/java/com/android/tools/r8/ir/desugar/desugaredlibrary/legacyspecification/LegacyDesugaredLibrarySpecificationParser.java b/src/main/java/com/android/tools/r8/ir/desugar/desugaredlibrary/legacyspecification/LegacyDesugaredLibrarySpecificationParser.java
index 328bbf4..e17494f 100644
--- a/src/main/java/com/android/tools/r8/ir/desugar/desugaredlibrary/legacyspecification/LegacyDesugaredLibrarySpecificationParser.java
+++ b/src/main/java/com/android/tools/r8/ir/desugar/desugaredlibrary/legacyspecification/LegacyDesugaredLibrarySpecificationParser.java
@@ -174,7 +174,8 @@
       throw reporter.fatalError(
           new StringDiagnostic(
               "Unsupported desugared library configuration version, please upgrade the D8/R8"
-                  + " compiler.",
+                  + " compiler."
+                  + " See https://developer.android.com/studio/build/library-desugaring-versions.",
               origin));
     }