Update 20-tiering-historicals.ipynb

FIx link

notebooks/03-query/20-tiering-historicals.ipynb

@@ -27,7 +27,7 @@
     "\n",
     "As an Apache Druid cluster administrator, you can use [Service tiering](https://druid.apache.org/docs/latest/operations/mixed-workloads#service-tiering) to provision cluster resources according to various performance and storage requirements. For example, you can isolate resource-intensive queries with complex subqueries and large result sets from high priority, interactive queries.\\n\"\n",
     "\n",
-    "This tutorial demonstrates how to create [historical tiers (https://druid.apache.org/docs/latest/operations/mixed-workloads#historical-tiering) to host different data based upon data age. Then, when you run a query, Druid uses the service that hosts the data corresponding to the time period within the query."
+    "This tutorial demonstrates how to create [historical tiers](https://druid.apache.org/docs/latest/operations/mixed-workloads#historical-tiering) to host different data based upon data age. Then, when you run a query, Druid uses the service that hosts the data corresponding to the time period within the query."
    ]
   },
   {