Fix author link of security.md

The generated link from "author:" header of the security.md wiki
article, was pointing to a nonexistent place.  Fix it.

Signed-off-by: keyboardan <keyboardan@tilde.club>

wiki/source/security.md

@@ -1,6 +1,8 @@
 ---
 title: Editing basic UNIX security the Tilde way
-author: michaelcoyote. updated by deepend
+author:
+ - michaelcoyote
+ - deepend
 category: tutorials
 ---