docs: increase success probability in examples

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/dnanmax/README.md

@@ -135,7 +135,7 @@ var bernoulli = require( '@stdlib/random/base/bernoulli' );
 var dnanmax = require( '@stdlib/stats/base/dnanmax' );
 
 function rand() {
-    if ( bernoulli( 0.2 ) < 1 ) {
+    if ( bernoulli( 0.8 ) < 1 ) {
         return NaN;
     }
     return uniform( -50.0, 50.0 );

lib/node_modules/@stdlib/stats/base/dnanmax/examples/index.js

@@ -24,7 +24,7 @@ var bernoulli = require( '@stdlib/random/base/bernoulli' );
 var dnanmax = require( './../lib' );
 
 function rand() {
-	if ( bernoulli( 0.2 ) < 1 ) {
+	if ( bernoulli( 0.8 ) < 1 ) {
 		return NaN;
 	}
 	return uniform( -50.0, 50.0 );