centered content of cell

src/docs/asciidoc/documentation.adoc

@@ -61,7 +61,7 @@ a|
 * <<jme3/build_jme3_sources_with_netbeans#,Building JME3 from the sources with NetBeans>>
 * <<jme3/simpleapplication_from_the_commandline#,Setting up JME3 on the commandline>>
 
-4+^.^a| <<jme3/jme3_source_structure#,Learn about the source structure>>
+4+^a| <<jme3/jme3_source_structure#,Learn about the source structure>>
 
 |===