typo fixed

README.md

@@ -77,7 +77,7 @@ Then check these settings for email:
 * **Required : notification email** set this to `discourse@$SERVERNAME` (use the actual domain name not $SERVERNAME)
 * **Email : reply by email enabled** tick *"Enable replying to topics via email."* 
 * **Email : reply by email address** set this to `discourse+%{reply_key}@$SERVERNAME` (use the actual domain name not $SERVERNAME)
-* **Email : manual polling enabled** rick *"Push emails using the API for email replies."*
+* **Email : manual polling enabled** tick *"Push emails using the API for email replies."*
 
 Then tighten some security settings: