Add hotfix guide

Tino Vazquez · Tino Vazquez · commit 61a9ee0560fa · 2018-10-11T15:53:57.000+02:00
diff --git a/source/intro_release_notes/index.rst b/source/intro_release_notes/index.rst
@@ -9,4 +9,5 @@ Introduction and Release Notes
 
    Concepts and Terminology <concepts_terminology/index>
    Release Notes 5.6.1 <release_notes/index>
+   Release Notes 5.6.2 Hotfix <release_notes_hotfix/index>
    Upgrades <upgrades/index>
