Fix missing variable declaration

Author: kgryte

lib/node_modules/@stdlib/math/special/iabs/README.md

@@ -72,7 +72,7 @@ x = array( [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ); // 2x2
 y = iabs( x );
 // returns <ndarray>
 
-v = y.get( 0, 1 );
+var v = y.get( 0, 1 );
 // returns 2.0
 
 bool = ( y === x );