Update install.md

Author: ilgooz

docs/intro/install.md

@@ -20,7 +20,7 @@ Before you install a new version of Starport, remove all existing Starport insta
 To remove the current Starport installation:
 
 1. On your terminal window, press Ctrl C to stop the chain that you started with `starport serve`.
-1. Remove the Starport binary with `rm $(which starport).
+1. Remove the Starport binary with `rm $(which starport)`.
    Depending on your user permissions, run the command with or without `sudo`.
 1. Repeat this step until all `starport` installations are removed from your system.