feat: update ndarray/base TypeScript declarations

Signed-off-by: stdlib-bot <82920195+stdlib-bot@users.noreply.github.com>

Author: stdlib-bot

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

@@ -3158,34 +3158,17 @@ interface Namespace {
 	*
 	* @param x - input array
 	* @param n - number of singleton dimensions to prepend
+	* @param writable - boolean indicating whether a returned array should be writable
 	* @returns output array
 	*
 	* @example
 	* var array = require( '@stdlib/ndarray/array' );
 	*
 	* var x = array( [ [ 1, 2 ], [ 3, 4 ] ] );
-	* // returns <ndarray>
-	*
-	* var shx = x.shape;
-	* // returns [ 2, 2 ]
-	*
-	* var y = ns.prependSingletonDimensions( x, 3 );
-	* // returns <ndarray>
-	*
-	* var shy = y.shape;
-	* // returns [ 1, 1, 1, 2, 2 ]
-	*
-	* var v = y.get( 0, 0, 0, 0, 0 );
-	* // returns 1
-	*
-	* v = y.get( 0, 0, 0, 0, 1 );
-	* // returns 2
-	*
-	* v = y.get( 0, 0, 0, 1, 0 );
-	* // returns 3
+	* // returns <ndarray>[ [ 1, 2 ], [ 3, 4 ] ]
 	*
-	* v = y.get( 0, 0, 0, 1, 1 );
-	* // returns 4
+	* var y = ns.prependSingletonDimensions( x, 3, false );
+	* // returns <ndarray>[ [ [ [ [ 1, 2 ], [ 3, 4 ] ] ] ] ]
 	*/
 	prependSingletonDimensions: typeof prependSingletonDimensions;