[doc] Re-added SISYPHE in TelemacDoc.cls

Required in particuler in GAIA user documentation.

documentation/data/TelemacDoc.cls

@@ -117,6 +117,7 @@
 \newcommand{\telma}{{\scshape Telemac-Mascaret}\xspace}
 \newcommand{\telemacsystem}{{\scshape Telemac-Mascaret system}\xspace}
 \newcommand{\telemac}[1]{{\scshape Telemac-#1}\xspace}
+\newcommand{\sisyphe}{{\scshape Sisyphe}\xspace}
 \newcommand{\stbtel}{{\scshape Stbtel}\xspace}
 \newcommand{\tomawac}{{\scshape Tomawac}\xspace}
 \newcommand{\artemis}{{\scshape Artemis}\xspace}