Fix minor English error

doc/guide.tex

@@ -5010,10 +5010,10 @@ The command line parameters:
         connections (see section \ref{epmd}).
   \titem{-detached}
         Starts the Erlang system detached from the system console.
-	Useful for running daemons and backgrounds processes.
+	Useful for running daemons and background processes.
   \titem{-noinput}
 	Ensures that the Erlang system never tries to read any input.
-	Useful for running daemons and backgrounds processes.
+	Useful for running daemons and background processes.
   \titem{-pa /var/lib/ejabberd/ebin}
 	Specify the directory where Erlang binary files (*.beam) are located.
   \titem{-s ejabberd}