Update README.md

Author: Andrey Safonov

README.md

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 # WebViewer - React sample
 
-[WebViewer](https://www.pdftron.com/webviewer) is a powerful JavaScript-based PDF Library that's part of the [PDFTron PDF SDK](https://www.pdftron.com). It provides a slick out-of-the-box responsive UI that interacts with the core library to view, annotate and manipulate PDFs that can be embedded into any web project.
+[WebViewer](https://www.pdftron.com/documentation/web/) is a powerful JavaScript-based PDF Library that's part of the [PDFTron PDF SDK](https://www.pdftron.com). It provides a slick out-of-the-box responsive UI that interacts with the core library to view, annotate and manipulate PDFs that can be embedded into any web project.
 
 ![WebViewer UI](https://www.pdftron.com/downloads/pl/webviewer-ui.png)