fix typo in node section

doc/update/8.16-to-8.17.md

@@ -55,7 +55,7 @@ GitLab now runs [webpack](http://webpack.js.org) to compile frontend assets and
 it has a minimum requirement of node v4.3.0.
 
 You can check which version you are running with `node -v`. If you are running
-a version older than `v4.3.0` you will should update to a newer version.  You
+a version older than `v4.3.0` you will need to update to a newer version.  You
 can find instructions to install from community maintained packages or compile
 from source at the nodejs.org website.