fix: use correct dimensions for array

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---

Author: Planeshifter

lib/node_modules/@stdlib/array/base/filled4d-by/docs/types/index.d.ts

@@ -48,7 +48,7 @@ type Callback<T, V> = Nullary<T, V> | Unary<T, V>;
 /**
 * Four-dimensional nested array.
 */
-type Array4D<T> = Array<Array<Array<T>>>;
+type Array4D<T> = Array<Array<Array<Array<T>>>>;
 
 /**
 * Returns a filled four-dimensional nested array according to a provided callback function.

lib/node_modules/@stdlib/array/base/filled4d/docs/types/index.d.ts

@@ -25,7 +25,7 @@ import { Shape4D } from '@stdlib/types/ndarray';
 /**
 * Four-dimensional nested array.
 */
-type Array4D<T> = Array<Array<Array<T>>>;
+type Array4D<T> = Array<Array<Array<Array<T>>>>;
 
 /**
 * Returns a filled four-dimensional nested array.