removing TODO for ignoring optional parameters, related to issue ivoa…

…-std#17

ConeSearch.tex

@@ -259,8 +259,7 @@ \subsubsection{VERB} The query \textbf{may} contain the optional single
 specify their meaning or usage. If a query includes an optional
 parameter, either one specified by this document or not, that is not
 supported by the service implementation, the service must ignore that
-parameter.\todo{MMo: I don't think I like this idea, it sound like
-failing silently}
+parameter.
 
 A query following this syntax represents a request for information on
 sources located within the specified cone on the sky.