QPR-13698 Specify frac in doc

Author: sebastien.bouvard

Docs/ScriptedTrade/docs/language.tex

@@ -410,7 +410,7 @@
 \stsubsection{Functions {\tt -}, abs, exp, ln, sqrt, frac}
 % ========================================================
 
-Unary functions {\tt -x}, {\tt abs(x)}, {\tt exp(x)}, {\tt ln(x)}, {\tt sqrt(x)}, {\tt frac(x)}, applicable to numbers only.
+Unary functions {\tt -x}, {\tt abs(x)}, {\tt exp(x)}, {\tt ln(x)}, {\tt sqrt(x)}, {\tt frac(x)} which take the fractional part of a float, applicable to numbers only.
 
 % =======================================================
 \stsubsection{Functions {\tt normalPdf}, {\tt normalCdf}}