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/signrank/quantile/src/main.c

@@ -55,7 +55,7 @@ static double weights( double x, const int32_t n ) {
 * @returns   evaluated quantile function
 *
 * @example
-* var y = stdlib_base_dists_signrank_quantile( 0.8, 5 );
+* double y = stdlib_base_dists_signrank_quantile( 0.8, 5 );
 * // returns 11
 */