Adds include_expired_exceptions parameter to Export exception list AP…

…I docs (#4360) (#4386)

(cherry picked from commit 86523b2)

Co-authored-by: natasha-moore-elastic <137783811+natasha-moore-elastic@users.noreply.github.com>

docs/detections/api/exceptions/api-export-exception-list.asciidoc

@@ -21,6 +21,7 @@ Exports an exception list and its associated items to an `.ndjson` file.
 * `agnostic`: Available in all {kib} spaces.
 
 |No, defaults to `single`.
+|`include_expired_exceptions` |Boolean |Determines whether to include expired exceptions in the exported list. |No, defaults to `true`.
 |==============================================
 
 ===== Example request