Update readme.md

Solutions/Farsight DNSDB/Playbooks/DNSDB_Historical_Address/readme.md

@@ -9,7 +9,7 @@ Learn more about the integration via the https://docs.microsoft.com/connectors/f
 ![Incident Comments](./Graphics/historical_address.png)
 
 
-## Links to deploy the DNSDB_Co_Located_Hosts playbook template:
+## Links to deploy the DNSDB_Historical_Address playbook template:
 
 [![Deploy to Azure](https://aka.ms/deploytoazurebutton)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2FAzure%2FAzure-Sentinel%2Fmaster%2FSolutions%2FFarsight%20DNSDB%2FPlaybooks%2FDNSDB_Historical_Address%2Fazuredeploy.json)