Added missing comma, reported by Eric Raymond.

Doc/lib/liballos.tex

-\chapter{Generic Operating System Services}
-\label{allos}
+\chapter{Generic Operating System Services \label{allos}}
 
 The modules described in this chapter provide interfaces to operating
 system features that are available on (almost) all operating systems,
 such as files and a clock.  The interfaces are generally modelled
-after the \UNIX{} or \C{} interfaces but they are available on most
+after the \UNIX{} or C interfaces, but they are available on most
 other systems as well.  Here's an overview:
 
 \localmoduletable