docs: Document mathematical functions

docs/kiln.1.scd

@@ -621,6 +621,50 @@ All templates have the following functions available to them:
 *lt* _arg1_, _arg2_
 	Returns the boolean truth of _arg1_ < _arg2_.
 
+*math.Add* _arg1_, _arg2_
+	Returns _arg1_ + _arg2_ as an integer if both arguments are
+	integers, otherwise as a float.
+
+*math.Sub* _arg1_, _arg2_
+	Returns _arg1_ - _arg2_ as an integer if both arguments are
+	integers, otherwise as a float.
+
+*math.Mul* _arg1_, _arg2_
+	Returns _arg1_ \* _arg2_ as an integer if both arguments are
+	integers, otherwise as a float.
+
+*math.Div* _arg1_, _arg2_
+	Returns _arg1_ / _arg2_ as a float.
+
+*math.Mod* _arg1_, _arg2_
+	Returns _arg1_ % _arg2_ as an integer.
+
+*math.Ceil* _arg_
+	Returns the least integer value greater than or equal to _arg_.
+
+*math.Floor* _arg_
+	Returns the greatest integer value less than or equal to _arg_.
+
+*math.Log* _arg_
+	Returns the natural logarithm of _arg_ as a float.
+
+*math.Max* _arg1_, _arg2_
+	Returns the greater of _arg1_ and _arg2_ as an integer if both arguments are
+	integers, otherwise as a float.
+
+*math.Min* _arg1_, _arg2_
+	Returns the lesser of _arg1_ and _arg2_ as an integer if both arguments are
+	integers, otherwise as a float.
+
+*math.Pow* _arg1_, _arg2_
+	Returns _arg1_ ^ _arg2_ as a float.
+
+*math.Round* _arg_
+	Returns the nearest integer to _arg_, rounding half away from zero.
+
+*math.Sqrt* _arg_
+	Returns square root of _arg_ as a float.
+
 *ne* _arg1_, _arg2_
 	Returns the boolean truth of _arg1_ != _arg2_.