Updated doc for getLogger()

Doc/lib/liblogging.tex

@@ -134,7 +134,10 @@ level functions.
 
 \begin{funcdesc}{getLogger}{\optional{name}}
 Return a logger with the specified name or, if no name is specified, return
-a logger which is the root logger of the hierarchy.
+a logger which is the root logger of the hierarchy. If specified, the name
+is typically a dot-separated hierarchical name like \var{"a"}, \var{"a.b"}
+or \var{"a.b.c.d"}. Choice of these names is entirely up to the developer
+who is using logging.
 
 All calls to this function with a given name return the same logger instance.
 This means that logger instances never need to be passed between different