Polishing.

Improve wording.

See #3438

Author: schauder

src/main/java/org/springframework/data/mapping/model/ClassGeneratingPropertyAccessorFactory.java

@@ -38,6 +38,7 @@
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Function;
+import java.util.stream.Collectors;
 
 import org.springframework.asm.ClassWriter;
 import org.springframework.asm.Label;