Set pass through for link in header example.

src/docs/asciidoc/wiki/wiki_header.adoc

@@ -18,7 +18,7 @@ All wiki documents use these header attributes. Optional attributes can be left
 :relfileprefix: ../../
 :imagesdir: ../..
 :experimental:
-:link-javadoc: https://javadoc.jmonkeyengine.org
+:link-javadoc: pass:[https://javadoc.jmonkeyengine.org]
 ifdef++::++env-github,env-browser[:outfilesuffix: .adoc]
 ----