Update README.md

remove a word

Author: Tom-Dynamsoft

README.md

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 This repository contains multiple samples that demonstrates how to use the [Dynamsoft Barcode Reader JavaScript Edition](https://www.dynamsoft.com/barcode-reader/sdk-javascript/).
 
-## Hello World samples
+## Hello World
 
 Get the basic features of the library working with plain/native JavaScript or within a framework like [Angular](https://angular.io/), [React](https://reactjs.org/) or [Vue](https://vuejs.org/), etc.