docs: update examples

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/buffer-dtype/README.md

@@ -102,7 +102,7 @@ for ( i = 0; i < DTYPES.length; i++ ) {
 
 // Try an array-like object...
 var buf = {
-    'length': 10
+    'length': len
 };
 dt = dtype( buf );
 console.log( '%s == %s => %s', 'generic', dt, dt === 'generic' );

lib/node_modules/@stdlib/ndarray/base/buffer-dtype/examples/index.js

@@ -40,7 +40,7 @@ for ( i = 0; i < DTYPES.length; i++ ) {
 
 // Try an array-like object...
 var buf = {
-	'length': 10
+	'length': len
 };
 dt = dtype( buf );
 console.log( '%s == %s => %s', 'generic', dt, dt === 'generic' );