Cleaned up wiki url by adding to a source block.

src/docs/asciidoc/wiki/atom_editor.adoc

@@ -41,9 +41,17 @@ TIP: You can add more GitHub controls to the editor by adding the package `*git-
 .  To edit the Wiki you will need to clone the wiki repository.
 ..  From the `Command Palette` (kbd:[ctrl]+kbd:[shift] +kbd:[P]  or `menu:Packages[Command Palette>Toggle]`), enter "`git`" into the search box.
 ..  Select btn:[GitHub: Clone].
-..  Paste `++https://github.com/jMonkeyEngine/wiki++` into the `Clone from` box. The `To directory` will automatically update when you do.
+..  Paste,
 +
+--
+[source]
+----
+https://github.com/jMonkeyEngine/wiki
+----
+into the `Clone from` box. The `To directory` will automatically update when you do.
+
 IMPORTANT: Use the +++<abbr title="Uniform Resource Locator">URL</abbr>+++ to your repository fork and clone your fork if a non-member.
+--
 
 ..  When you're ready, press the btn:[Clone] button.
 +