fix docs

inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/Context.java

@@ -20,6 +20,15 @@
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+/**
+ * Transform context.
+ *
+ * <p>configuration</p> is the global configuration when init transform processor
+ * <p>extParams</p> is the ext params of each data
+ * <p>runtimeParams</p> is the runtime outputs when processing by each component
+ *
+ * The priority is runtimeParams > extParams > configuration.
+ */
 public class Context {
 
     private final Map<String, Object> configuration;