Update title format in performance FAQs document

colon is causing the build to fail

Author: KCCross

support/azure/app-service/web-apps-performance-faqs.md

@@ -1,5 +1,5 @@
 ---
-title: Azure App Service FAQ: Availability, Performance, and Application Issues
+title: Azure App Service FAQ - Availability, Performance, and Application Issues
 description: Get answers to frequently asked questions about availability, performance, and application issues in Azure App Service.
 author: JarrettRenshaw
 ms.author: jarrettr