Update sign-in-out.md

typo fix

Author: dzucker-tab

docs/sign-in-out.md

@@ -17,7 +17,7 @@ with server.auth.sign_in(tableau_auth):
 
 `SERVER_URL` is the URL of your Tableau server without subpaths. For local Tableau servers, an example would be: `https://www.MY_SERVER.com`. For Tableau Online, an example would be: `https://10ax.online.tableau.com/`.
 
-`SITENAME` is the subpath of your site of your full site URL (also called `contentURL` in the REST API). `MYSITE` would be the site name of `https://10ax.online.tableau.com/MYSITE`. This parameter can be omitted when signing in to the Default site of a locally installed Tableau server.
+`SITENAME` is the subpath of your full site URL (also called `contentURL` in the REST API). `MYSITE` would be the site name of `https://10ax.online.tableau.com/MYSITE`. This parameter can be omitted when signing in to the Default site of a locally installed Tableau server.
 
 Optionally, you can override the version of Tableau API you are authorizing against by adding `server.version = '<VERSION_NUMBER>'` before the `auth.signin` call.