refactor: reapply suggestions from PR review

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Author: anandkaranubc

lib/node_modules/@stdlib/stats/base/dists/arcsine/mean/examples/c/example.c

@@ -17,8 +17,8 @@
 */
 
 #include "stdlib/stats/base/dists/arcsine/mean.h"
-#include <stdio.h>
 #include <stdlib.h>
+#include <stdio.h>
 
 static double random_uniform( const double min, const double max ) {
 	double v = (double)rand() / ( (double)RAND_MAX + 1.0 );

lib/node_modules/@stdlib/stats/base/dists/arcsine/mean/include/stdlib/stats/base/dists/arcsine/mean.h

@@ -27,7 +27,7 @@ extern "C" {
 #endif
 
 /**
-* Returns the mean of an arcsine distribution with minimum support `a` and maximum support `b`.
+* Returns the expected value of an arcsine distribution.
 */
 double stdlib_base_dists_arcsine_mean( const double a, const double b );