Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17477#discussion_r111087424
--- Diff: core/src/main/scala/org/apache/spark/rpc/RpcEndpoint.scala ---
@@ -35,7 +35,7 @@ private[spark] trait RpcEnvFactory {
*
* The life-cycle of an endpoint is:
*
- * constructor -> onStart -> receive* -> onStop
+ * {@code constructor -> onStart -> receive* -> onStop}
--- End diff --
After this, it produces the documentation as below (manually tested)
**Scaladoc**

**Javadoc**

This also seems not exposed to API documentation anyway.
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