Add Fleet & Agent 8.16.5 Release Notes (elastic#1711) (elastic#1717)

(cherry picked from commit c089d03)

Author: kilfoyle

docs/en/ingest-management/release-notes/release-notes-8.16.asciidoc

@@ -206,7 +206,6 @@ curl -XPOST -H 'Authorization: Bearer ${TOKEN}' -H 'x-elastic-product-origin:fle
 
 // begin 8.16.0 relnotes
 
->>>>>>> d7a2989 (Add Fleet & Agent 8.16.2 Release Notes (#1538))
 [[release-notes-8.16.0]]
 == {fleet} and {agent} 8.16.0