Fix typo in installation instructions

Summary: As per title

Reviewed By: jcpetruzza

Differential Revision: D62226950

fbshipit-source-id: c1e17789434c5c81ba0d4343611edff3a6e0bbfe

website/docs/get-started/install.md

@@ -102,6 +102,6 @@ The produced executable will be available in: `target/release/elp`, so ensure it
 
 ```
 mkdir -p ~/bin
-mv target/releases/elp ~/bin
+mv target/release/elp ~/bin
 export PATH=$PATH:~/bin
 ```