docs: fix typo (#3044)

Author: snitin315

README.md

@@ -161,7 +161,7 @@ needed modifications to the code for the module. Because of that, we ask users
 with general support, "how-to", or "why isn't this working" questions to try one
 of the other support channels that are available.
 
-Your first-stop-shop for support for webpack-dev-server should by the excellent
+Your first-stop-shop for support for webpack-dev-server should be the excellent
 [documentation][docs-url] for the module. If you see an opportunity for improvement
 of those docs, please head over to the [webpack.js.org repo][wjo-url] and open a
 pull request.