Fix error message in SynchronossPartHttpMessageReader

spring-web/src/main/java/org/springframework/http/codec/multipart/SynchronossPartHttpMessageReader.java

@@ -356,7 +356,7 @@ public class SynchronossPartHttpMessageReader extends LoggingCodecSupport implem
 			this.isFilePart = (MultipartUtils.getFileName(headers) != null);
 			this.partSize = 0;
 			if (maxParts > 0 && index > maxParts) {
-				throw new DecodingException("Too many parts (" + index + " allowed)");
+				throw new DecodingException("Too many parts (" + index + "/" + maxParts + " allowed)");
 			}
 			return this.storageFactory.newStreamStorageForPartBody(headers, index);
 		}

spring-web/src/test/java/org/springframework/http/codec/multipart/SynchronossPartHttpMessageReaderTests.java

@@ -170,7 +170,7 @@ public class SynchronossPartHttpMessageReaderTests extends AbstractLeakCheckingT
 							.isInstanceOf(DecodingException.class)
 							.hasMessageStartingWith("Failure while parsing part[2]");
 					assertThat(ex.getCause())
-							.hasMessage("Too many parts (2 allowed)");
+							.hasMessage("Too many parts (2/1 allowed)");
 				}
 		);
 	}