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

@@ -310,7 +310,7 @@ static double gausslegdquad( const double q, const double aii, const double r, c
 * // returns ~0.913
 *
 * @example
-* var y = cdf( 0.5, 3.0, 2.0, 2 );
+* double y = cdf( 0.5, 3.0, 2.0, 2 );
 * // returns ~0.01
 */
 double stdlib_base_dists_studentized_range_cdf( const double q, const double r, const double v, const double nranges ) {