Revert D52861937: Augment thrift.ExceptionMessage docs

Differential Revision:
D52861937

Original commit changeset: d9dc88d32f33

Original Phabricator Diff: D52861937

fbshipit-source-id: 29713a9d09ce79b76c11696d6e7602d4004783f4

Author: Arjun Hande H N

third-party/thrift/src/thrift/annotation/thrift.thrift

@@ -167,22 +167,6 @@ struct BitmaskEnum {}
 
 /**
  * Specifies the field where the exception message is stored.
- *
- * The "exception message" is typically a human-readable description of the
- * exception. It is made available to the exception-handling code via standard,
- * language-dependent APIs of the generated code, such as:
- *   - [`std::exception::what()`](https://en.cppreference.com/w/cpp/error/exception/what)
- *      in C++.
- *   - [`Throwable.getMessage()`](https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html#getMessage--)
- *     in Java.
- *   - etc.
- *
- * This annotation can be specified on at most one field of an
- * [exception definition](https://github.com/facebook/fbthrift/blob/main/thrift/doc/idl/index.md#exceptions),
- * whose type must be `string`.
- *
- * If an exception definition does not specify this anotation for any field, the
- * exception message returned by the aforementioned APIs is unspecified.
  */
 @scope.Field
 struct ExceptionMessage {}

third-party/thrift/src/thrift/doc/features/exception.md

@@ -13,12 +13,6 @@ A **declared** exception is an exception struct defined in IDL. Interfaces can d
 
 An **undeclared** exception is thrown by Thrift methods that are wrapped into a generic [TApplicationException](https://github.com/facebook/fbthrift/blob/main/thrift/lib/cpp/TApplicationException.h) or [TTransportException](https://github.com/facebook/fbthrift/blob/main/thrift/lib/cpp/transport/TTransportException.h) and passed to the client. It is similar to throwing generic exceptions (e.g. `Exception` or `std::exception`) and is generally discouraged since it is too general to carry sufficient information. It is highly encouraged to avoid as much as possible throwing undeclared exceptions.
 
-### Exception Message
-
-A custom (human-readable) exception message may be specified in a field, by
-annotating it with
-[`@thrift.ExceptionMessage`](/idl/annotations.md#thrift-annotations).
-
 ## Error Classification
 ### Kind
 Thrift Error can be classified into three categories: **Transient**, **Stateful**, and **Permanent**.