style: fix variable declaration order in planck/logcdf examples

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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/planck/logcdf/examples/index.js

@@ -25,8 +25,8 @@ var logcdf = require( './../lib' );
 var x = discreteUniform( 10, 0, 5 );
 var lambda = uniform( 10, 0.1, 5.0 );
 
-var y;
 var i;
+var y;
 for ( i = 0; i < lambda.length; i++ ) {
 	y = logcdf( x[ i ], lambda[ i ] );
 	console.log( 'x: %d, λ: %d, F(x;λ): %d', x[ i ].toFixed( 4 ), lambda[ i ].toFixed( 4 ), y.toFixed( 4 ) );