update introduction from overleaf

latex/NEMO/subfiles/introduction.tex

@@ -41,7 +41,7 @@ Momentum equations are formulated in vector invariant or flux form.
 Dimensional units in the meter, kilogram, second (MKS) international system are used throughout.
 
 The following chapters deal with the discrete equations.
-\autoref{chap:STP} presents the time domain.
+This part deals with the continuous equations of the model\autoref{chap:STP} presents the time domain.
 The model time stepping environment is a three level scheme in which 
 the tendency terms of the equations are evaluated either centered in time, or forward, or backward depending of 
 the nature of the term.