chore: revert changes in cosine namespace

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/cosine/README.md

@@ -108,54 +108,10 @@ var y = dist.cdf( 0.5 );
 <!-- eslint no-undef: "error" -->
 
 ```javascript
+var objectKeys = require( '@stdlib/utils/keys' );
 var cosine = require( '@stdlib/stats/base/dists/cosine' );
 
-
-// Create a raised cosine distribution
-var mu = 2.0;
-var s = 1.5;
-var dist = new cosine.Cosine( mu, s );
-
-// Calculate various distribution properties
-console.log( 'Mean: %d', dist.mean );
-// => Mean: 2
-
-console.log( 'Median: %d', dist.median );
-// => Median: 2
-
-console.log( 'Mode: %d', dist.mode );
-// => Mode: 2
-
-console.log( 'Standard Deviation: %d', dist.stdev );
-// => Standard Deviation: 0.6123724356957945
-
-console.log( 'Variance: %d', dist.variance );
-// => Variance: 0.375
-
-// Evaluate the probability density function (PDF)
-var x = 1.5;
-console.log( 'PDF( %d ): %d', x, dist.pdf( x ) );
-// => PDF( 1.5 ): 0.2886751345948129
-
-// Evaluate the cumulative distribution function (CDF)
-console.log( 'CDF( %d ): %d', x, dist.cdf( x ) );
-// => CDF( 1.5 ): 0.21132486540518708
-
-// Generate random samples
-var samples = new Array( 5 );
-for ( var i = 0; i < 5; i++ ) {
-    samples[ i ] = dist.quantile( Math.random() );
-}
-console.log( 'Samples: %s', samples.join( ', ' ) );
-// => Samples: 2.2642152512549444, 2.7489308009950834, 1.6391832278662363, 1.3555922486975812, 2.4894454832467757
-
-// Calculate distribution moments
-console.log( 'Skewness: %d', cosine.skewness( mu, s ) );
-// => Skewness: 0
-
-console.log( 'Excess Kurtosis: %d', cosine.kurtosis( mu, s ) );
-// => Excess Kurtosis: -0.5933333333333333
-
+console.log( objectKeys( cosine ) );
 ```
 
 </section>