docs: improve doctests for complex number instances in array/base/accessors

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---

Author: anandkaranubc

lib/node_modules/@stdlib/array/base/accessors/README.md

@@ -115,7 +115,7 @@ console.log( 'Accessor protocol: %s', bool );
 
 // Retrieve an array element:
 var v = obj.accessors[ 0 ]( x, 1 );
-// returns <Complex64>
+// returns <Complex64>[ 2.0, 3.0 ]
 
 console.log( 'x[1] = %s', v.toString() );
 ```

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

@@ -761,7 +761,7 @@ declare function accessors( x: Uint8ClampedArray ): Uint8cAccessorObject;
 * // returns [ <Function>, <Function> ]
 *
 * var v = fcns[ 0 ]( x, 1 );
-* // returns <Complex128>
+* // returns <Complex128>[ 3.0, 4.0 ]
 */
 declare function accessors( x: Complex128Array ): Complex128AccessorObject;
 
@@ -789,7 +789,7 @@ declare function accessors( x: Complex128Array ): Complex128AccessorObject;
 * // returns [ <Function>, <Function> ]
 *
 * var v = fcns[ 0 ]( x, 1 );
-* // returns <Complex64>
+* // returns <Complex64>[ 3.0, 4.0 ]
 */
 declare function accessors( x: Complex64Array ): Complex64AccessorObject;