Fixed missing heading

Author: alenros

jekyll/_cci2/xcode-policy.md

@@ -70,7 +70,8 @@ To read about our customer support policy regarding beta images, please check ou
 We closely track and monitor Apple’s Xcode releases and always endeavor to release new images as quickly as possible. We can not provide an official SLA turnaround time for this as it is highly dependent on any changes made in Xcode and macOS.
 
 New images are always announced on our [Discuss site](https://discuss.circleci.com/c/announcements/39) along with release notes and will be added to the table of [Xcode versions in the documentation](https://circleci.com/docs/2.0/testing-ios/#supported-xcode-versions). 
-macOS Versions
+
+## macOS Versions
 
 Each Xcode image is built on top of a clean macOS install. We aim to keep the macOS version as stable as possible by only updating it when the minimum version requirement for Xcode is increased. When this occurs, we will update the macOS version to the latest stable version that is available.