Update INSTALL.md (#1329)

Summary:
fix url

Pull Request resolved: https://github.com/facebook/infer/pull/1329

Reviewed By: martintrojer

Differential Revision: D24416844

Pulled By: jvillard

fbshipit-source-id: b19c4b6fa

INSTALL.md

@@ -5,7 +5,7 @@
 We provide a binary release of Infer. We encourage you to use this
 release as compiling infer's dependencies is time-consuming. Follow
 the instructions in our [Getting
-Started](http://fbinfer.com/docs/getting-started.html#install-from-source)
+Started](http://fbinfer.com/docs/getting-started/#get-infer)
 page to install Infer.