fix missing word in MAXREC preamble

ConeSearch.tex

@@ -167,7 +167,7 @@ \section{Service Interface Requirements}
 				\item[Example]
 					\url{http://mycone.org/cgi-bin/search?RA=180.567&DEC=-30.45&SR=0.0125}
 			\end{bigdescription}
-		\item As defined by DALI a SHOULD also understand the following parameter:
+		\item As defined by DALI a service SHOULD also understand the following parameter:
 			\begin{description}
 				\item[\textbf{MAXREC}] to let the client limit the number of records returned
 					or require a service metadata response. Its usage is encouraged and preferred