docs: fix comment

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/unary-reduce-strided1d-dispatch/docs/types/test.ts

@@ -143,7 +143,7 @@ import UnaryStrided1dDispatch = require( './index' );
 	unary<number, number>( table, [ dtypes ], ( x: number ): number => x, policies ); // $ExpectError
 }
 
-// The compiler throws an error if the function is provided a fourth argument which is invalid policies object...
+// The compiler throws an error if the function is provided a fourth argument which is an invalid policies object...
 {
 	const dtypes: Array<DataType> = [ 'float64', 'float32' ];
 	const table = {