AUT-2597 Add a note regarding recursive fallbacks

Author: madislm

src/main/java/eu/webeid/resilientocsp/ResilientOcspCertificateRevocationChecker.java

@@ -139,6 +139,8 @@ private CheckedSupplier<RevocationInfo> buildFallbackSupplier(OcspService primar
                 throw e;
             }
         };
+        // NOTE: Up to two fallbacks are currently supported. To enable the full potential of recursive fallbacks
+        // with FallbackOcspService#getNextFallback, the fallback supplier creation needs to be changed.
         OcspService secondFallbackService = firstFallbackService.getNextFallback();
         if (secondFallbackService == null) {
             return firstFallbackSupplier;