Fix typo in OperationResponsePreprocessor javadoc
See
@@ -19,7 +19,7 @@ package org.springframework.restdocs.operation.preprocess;
import org.springframework.restdocs.operation.OperationResponse;
/**
- * An {@code OperationRequestPreprocessor} is used to modify an {@code OperationRequest}
+ * An {@code OperationResponsePreprocessor} is used to modify an {@code OperationResponse}
* prior to it being documented.
*
* @author Andy Wilkinson
