fix: changed the variable datatype from var to double in example code snippet

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---

Author: nirmaljb

lib/node_modules/@stdlib/stats/base/dists/studentized-range/cdf/src/main.c

@@ -302,14 +302,6 @@ static double gausslegdquad( const double q, const double aii, const double r, c
 * @returns   evaluated CDF
 *
 * @example
-* var y = cdf( 0.5, 3.0, 2.0 );
-* // returns ~0.0644
-*
-* @example
-* var y = cdf( 12.1, 17.0, 2.0 );
-* // returns ~0.913
-*
-* @example
 * double y = cdf( 0.5, 3.0, 2.0, 2 );
 * // returns ~0.01
 */