doc: add documentation for stream.destroyed

PR-URL: #28815
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>

Author: ronag

doc/api/stream.md

@@ -380,6 +380,15 @@ the `'drain'` event before destroying the stream.
 Implementors should not override this method,
 but instead implement [`writable._destroy()`][writable-_destroy].
 
+##### writable.destroyed
+<!-- YAML
+added: v8.0.0
+-->
+
+* {boolean}
+
+Is `true` after [`writable.destroy()`][writable-destroy] has been called.
+
 ##### writable.end([chunk][, encoding][, callback])
 <!-- YAML
 added: v0.9.4
@@ -916,6 +925,15 @@ will be ignored.
 Implementors should not override this method, but instead implement
 [`readable._destroy()`][readable-_destroy].
 
+##### readable.destroyed
+<!-- YAML
+added: v8.0.0
+-->
+
+* {boolean}
+
+Is `true` after [`readable.destroy()`][readable-destroy] has been called.
+
 ##### readable.isPaused()
 <!-- YAML
 added: v0.11.14