Apply review suggestion to java.rst

Co-authored-by: Jason(Zhe-You) Liu <68415893+jason810496@users.noreply.github.com>

Author: FrankYang0529

airflow-core/docs/authoring-and-scheduling/language-sdks/java.rst

@@ -206,11 +206,11 @@ Implement the ``Task`` interface directly for full control over how tasks are re
 read.
 
 The runner creates a fresh instance of the task class through reflection for every task-instance run,
-which puts three constraints on the class. It must be:
+which puts three constraints on the class:
 
-* Concrete: not abstract and not an interface.
-* A public no-argument constructor.
-* If nested inside another class, it must be ``static`` class.
+* It must be concrete: not abstract and not an interface.
+* It must declare a public no-argument constructor.
+* If nested inside another class, it must be a ``static`` nested class.
 
 A class that violates any of these fails at runtime with a ``Cannot instantiate task class`` error in the
 task log.