#51 - Add documentation reference into error message

Author: rbygrave

inject-generator/src/main/java/io/avaje/inject/generator/MetaDataOrdering.java

@@ -13,7 +13,8 @@ class MetaDataOrdering {
 
   private static final String CIRC_ERR_MSG =
     "To handle circular dependencies consider using field injection " +
-      "rather than constructor injection on one of the dependencies.";
+      "rather than constructor injection on one of the dependencies. " +
+      "\n See https://avaje.io/inject/#circular";
 
   private final ProcessingContext processingContext;