Fix Authors of manual

docs/manual/src/asciidoctor/index.adoc

@@ -1,5 +1,5 @@
 = Spring Security Reference
-:author: Ben Alex, Luke Taylor, Rob Winch
+Ben Alex; Luke Taylor; Rob Winch
 
 Spring Security is a powerful and highly customizable authentication and access-control framework. It is the de-facto standard for securing Spring-based applications.