docs(isString): update jsdoc

Author: sciborrudnicki

packages/type/src/is/lib/is-string.func.ts

@@ -11,7 +11,7 @@ import { ResultCallback } from '../../type/result-callback.type';
  * @param value Any `value` to check.
  * @param callback `ResultCallback` function to handle result before returns.
  * @callback `resultCallback`.
- * @returns A `boolean` indicating whether or not the `value` is a `string`.
+ * @returns A `boolean` indicating whether or not the `value` is a `string` type or `String` object.
  */
 export const isString: IsString = (value: any, callback: ResultCallback = resultCallback): value is string =>
   callback(typeOf(value) === 'string' && (isStringType(value) || isStringObject(value)), value);