Rename file per requirement

Author: MikeRayMSFT

…ig-data-cluster/perf-guidelines-tuned.md …-cluster/performance-guidelines-tuned.mddocs/big-data-cluster/perf-guidelines-tuned.md renamed to docs/big-data-cluster/performance-guidelines-tuned.md docs/big-data-cluster/perf-guidelines-tuned.md renamed to docs/big-data-cluster/performance-guidelines-tuned.md

@@ -155,7 +155,7 @@ done
 
 For more resources including reference architectures for SQL Server Big Data Clusters, see:
 
-* [Case Study: SQL Workloads running on Apache Spark in [MS SQL Server 2019 Big Data Cluster](https://aka.ms/sql-bdc-spark-perf/)
+* [Case Study: SQL Workloads running on Apache Spark in MS SQL Server 2019 Big Data Cluster](https://aka.ms/sql-bdc-spark-perf/)
 
 * [HPE Reference Architecture for delivering insight across all your data with Microsoft SQL Server 2019 Big Data Clusters](https://h20195.www2.hpe.com/V2/GetDocument.aspx?docname=a50001963enw)
 

docs/toc.yml

@@ -297,7 +297,7 @@
     - name: Performance
       items:
         - name: Tuning guide
-          href: big-data-cluster/perf-guidelines-tuned.md
+          href: big-data-cluster/performance-guidelines-tuned.md
     - name: Secure
       items:
       - name: Kubernetes RBAC for BDC