Update 756-math-sgn.markdown

Author: Joe7M

_build/reference/756-math-sgn.markdown

@@ -2,16 +2,10 @@
 
 > SGN (x)
 
-Sign of x (+1 for positive, -1 for negative and 0 for zero).
+Sign of x (+1 for positive, -1 for negative and 0 for zero). SGN cannot accept a numeric string, such as "24", as an argument.
 
-    Built-in:    SGN
-    Syntax:      SGN(numeric-expression)
-    Description: SGN returns a value indicating the sign of a numeric expression (1 if the
-                 expression is positive, 0 if it is zero, or -1 if it is negative).
-    Comment:     SGN cannot accept a numeric string, such as "24", as an argument.
-    Example:
-                 PRINT SGN(1), SGN(-1), SGN(0)  ' Output is:  1  -1  0
-                 PRINT SGN(CINT("-2"))          ' Output is:  -1
-                 PRINT SGN("2 + 1")             ' Error
-    See Also:    ABS, ABSMAX, ABSMIN, CINT
+```
+PRINT SGN(2), SGN(-2), SGN(0)  ' Output is:   1 -1  0
+PRINT SGN(INT("-2"))           ' Output is:  -1
+```