fix: fixed errors in examples

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---

Author: prajjwalbajpai

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

@@ -121,21 +121,21 @@ The `N` and stride parameters determine which elements in the strided array are
 ```javascript
 var x = [ 1.0, 2.0, 2.0, -7.0, -2.0, 3.0, 4.0, 2.0, NaN ];
 
-var v = nanvariancewd( 4, 1, x, 2 );
+var v = nanvariancewd( 5, 1, x, 2 );
 // returns 6.25
 ```
 
 Note that indexing is relative to the first index. To introduce an offset, use [`typed array`][mdn-typed-array] views.
 
-<!-- eslint-disable stdlib/capitalized-comments -->
+<!-- eslint-disable stdlib/capitalized-comments, max-len -->
 
 ```javascript
 var Float64Array = require( '@stdlib/array/float64' );
 
-var x0 = new Float64Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0, NaN ] );
+var x0 = new Float64Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0, NaN, NaN ] );
 var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
 
-var v = nanvariancewd( 4, 1, x1, 2 );
+var v = nanvariancewd( 5, 1, x1, 2 );
 // returns 6.25
 ```
 

lib/node_modules/@stdlib/stats/base/nanvariancewd/docs/repl.txt

@@ -50,14 +50,14 @@
     ~4.3333
 
     // Using `N` and stride parameters:
-    > x = [ -2.0, 1.0, 1.0, -5.0, 2.0, -1.0 ];
-    > {{alias}}( 3, 1, x, 2 )
+    > x = [ -2.0, 1.0, 1.0, -5.0, 2.0, -1.0, NaN ];
+    > {{alias}}( 4, 1, x, 2 )
     ~4.3333
 
     // Using view offsets:
-    > var x0 = new {{alias:@stdlib/array/float64}}( [ 1.0, -2.0, 3.0, 2.0, 5.0, -1.0 ] );
+    > var x0 = new {{alias:@stdlib/array/float64}}( [ 1.0, -2.0, 3.0, 2.0, 5.0, -1.0, NaN, NaN ] );
     > var x1 = new {{alias:@stdlib/array/float64}}( x0.buffer, x0.BYTES_PER_ELEMENT*1 );
-    > {{alias}}( 3, 1, x1, 2 )
+    > {{alias}}( 4, 1, x1, 2 )
     ~4.3333