runtime(hlyank): add the hlyank package

closes: #16919
related: #16866

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index b7791cc..dc47f41 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -4998,6 +4998,8 @@
 		Can also be used as a |method|: >
 			getpos('.')->getregionpos(getpos("'a"))
 <
+		For an example, see the highlight-yank plugin |52.6|
+
 		Return type: list<list<list<number>>>