add logo doc link

docs/modules/ROOT/pages/documentation.adoc

@@ -20,7 +20,7 @@ The link:http://hub.jmonkeyengine.org/[forum] is your first stop when reporting
 
 == Install
 
-Before installing, check the xref:bsd_license.adoc[license], xref:getting-started/features.adoc[features], and xref:getting-started/requirements.adoc[requirements]. Then choose one of these options:
+Before installing, check the xref:bsd_license.adoc[license], xref:logo.adoc[Logo], xref:getting-started/features.adoc[features], and xref:getting-started/requirements.adoc[requirements]. Then choose one of these options:
 [cols="4", options="header"]
 |===