typo: iteractive -> interactive (#1319)

Author: n8henrie

book/configuration.md

@@ -140,7 +140,7 @@ If Nushell is used as a login shell, you can use a specific configuration file w
 
 The file `login.nu` is sourced after `env.nu` and `config.nu`, so that you can overwrite those configurations if you need. There is an environment variable `$nu.loginshell-path` containing the path to this file.
 
-What about customizing iteractive shells, similar to `.zshrc`? By default `config.nu` is only loaded in interactive shells, not scripts.
+What about customizing interactive shells, similar to `.zshrc`? By default `config.nu` is only loaded in interactive shells, not scripts.
 
 ### macOS: Keeping `/usr/bin/open` as `open`