refactor: apply suggestions from previous PRs

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Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/chisquare/kurtosis/README.md

@@ -144,7 +144,7 @@ for ( i = 0; i < 10; i++ ) {
 
 #### stdlib_base_dists_chisquare_kurtosis( k )
 
-Returns the excess kurtosis of a chi-squared distribution.
+Returns the [excess kurtosis][kurtosis] of a [chi-squared][chisquare-distribution] distribution with degrees of freedom `k`.
 
 ```c
 double out = stdlib_base_dists_chisquare_kurtosis( 9.0 );

lib/node_modules/@stdlib/stats/base/dists/chisquare/kurtosis/benchmark/c/benchmark.c

@@ -16,12 +16,12 @@
 * limitations under the License.
 */
 
-#include <sys/time.h>
 #include "stdlib/stats/base/dists/chisquare/kurtosis.h"
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
+#include <sys/time.h>
 
 #define NAME "chisquare-kurtosis"
 #define ITERATIONS 1000000

lib/node_modules/@stdlib/stats/base/dists/chisquare/kurtosis/src/main.c

@@ -21,8 +21,8 @@
 /**
 * Returns the excess kurtosis of a chi-squared distribution.
 *
-* @param k    degrees of freedom (must be positive)
-* @return     excess kurtosis, or NaN if input is invalid
+* @param k: PositiveNumber - degrees of freedom
+* @return PositiveNumber - excess kurtosis
 *
 * @example
 * double v = stdlib_base_dists_chisquare_kurtosis( 9.0 );