Fix spf-optimizer TOC link
@@ -16,7 +16,7 @@ title: TOC
## Advanced Topics
- [Testing]({{site.github.url}}/unittests): Unit Testing DNS Data.
-- [SPF Optimizer]({{site.github.url}}/spf): Optimize your SPF records.
+- [SPF Optimizer]({{site.github.url}}/spf-optimizer): Optimize your SPF records.
## Developer info
- [GitHub](https://github.com/StackExchange/dnscontrol): Get the source!
