Fix bad link in plugin docs

docs/plugins/lang-javascript.asciidoc

@@ -1,7 +1,7 @@
 [[lang-javascript]]
 === JavaScript Language Plugin
 
-deprecated[5.0.0,JavaScript will be replaced by the new scripting language <<modules-scripting-painless, `Painless`>>]
+deprecated[5.0.0,JavaScript will be replaced by the new scripting language {ref}/modules-scripting-painless.html[`Painless`]]
 
 The JavaScript language plugin enables the use of JavaScript in Elasticsearch
 scripts, via Mozilla's

docs/plugins/lang-python.asciidoc

@@ -1,7 +1,7 @@
 [[lang-python]]
 === Python Language Plugin
 
-deprecated[5.0.0,Python will be replaced by the new scripting language <<modules-scripting-painless, `Painless`>>]
+deprecated[5.0.0,Python will be replaced by the new scripting language {ref}/modules-scripting-painless.html[`Painless`]]
 
 The Python language plugin enables the use of Python in Elasticsearch
 scripts, via the http://www.jython.org/[Jython] Java implementation of Python.