Merge pull request #6545 from umbraco/15/syncing

Add more articles to 15

Author: sofietoft

15/umbraco-cms/SUMMARY.md

@@ -81,6 +81,9 @@
 * [Common Pitfalls & Anti-Patterns](reference/common-pitfalls.md)
 * [UmbracoMapper](reference/mapping.md)
 * [Depencency Injection / IoC](reference/using-ioc.md)
+* [Cache & Distributed Cache](reference/cache/README.md)
+  * [Examples](reference/cache/examples/README.md)
+    * [Working with caching](reference/cache/examples/tags.md)
 
 ## Tutorials
 

15/umbraco-cms/release-candidate-guide.md

@@ -72,3 +72,4 @@ Here is a list of all the articles that are new to this version or have been upd
   * [Image Cropper](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/image-cropper.md)
   * [UmbracoMapper](reference/mapping.md)
   * [Depencency Injection / IoC](reference/using-ioc.md)
+  * [Working with Caching: Tags example](reference/cache/examples/tags.md)