chore: fix style and return values

PR-URL: #5871
Closes: #5863
Ref: a74d773
Reviewed-by: Athan Reines <[email protected]>

Author: anxhukumar

lib/node_modules/@stdlib/stats/base/dists/frechet/logcdf/README.md

@@ -202,7 +202,7 @@ Evaluates the natural logarithm of the [cumulative distribution function][cdf] (
 
 ```c
 double y = stdlib_base_frechet_logcdf( 10.0, 2.0, 3.0, 2.0 );
-// returns ~0.141
+// returns ~-0.141
 ```
 
 The function accepts the following arguments:

lib/node_modules/@stdlib/stats/base/dists/frechet/logcdf/benchmark/c/benchmark.c

@@ -111,7 +111,7 @@ static double benchmark( void ) {
 
 	t = tic();
 	for ( i = 0; i < ITERATIONS; i++ ) {
-		y = stdlib_base_dists_frechet_logcdf( x[i%100], alpha[ i%100 ], s[ i%100 ], m[ i%100 ] );
+		y = stdlib_base_dists_frechet_logcdf( x[ i%100 ], alpha[ i%100 ], s[ i%100 ], m[ i%100 ] );
 		if ( y != y ) {
 			printf( "should not return NaN\n" );
 			break;

lib/node_modules/@stdlib/stats/base/dists/frechet/logcdf/src/main.c

@@ -32,7 +32,7 @@
 *
 * @example
 * double y = stdlib_base_dists_frechet_logcdf( 10.0, 2.0, 3.0, 2.0 );
-* // returns ~0.141
+* // returns ~-0.141
 */
 double stdlib_base_dists_frechet_logcdf( const double x, const double alpha, const double s, const double m ) {
 	double z;