Link to tutorial "Histogram Registry" was broken.

Author: pbuehler

docs/basics-tasks/BasicAnalysisTask.md

@@ -197,5 +197,4 @@ std::shared_ptr<T>& get(const H& histName)
 Again HIST("histname") must be provided as argument to get the histogram with name = histname.
 
 Practical examples of histogram manipulations in O2 can be found in the
-tutorials [Histograms](../tutorials/histograms.md) and [Histogram
-Registry](../tutorials/histogramRegistry.md).
+tutorials [Histograms](../tutorials/histograms.md) and [Histogram Registry](../tutorials/histogramRegistry.md).

docs/tutorials/histogramRegistry.md

@@ -3,6 +3,8 @@ sort: 5
 title: Histogram Registry
 ---
 
+# Histogram Registry
+
 ```goal
 Learn how to create, fill, and manage histograms and other objects
 ```
@@ -12,8 +14,6 @@ Learn how to create, fill, and manage histograms and other objects
   Executable: o2-analysistutorial-histogram-registry
 </div>
 
-# Histogram Registry
-
 The histogram registry is an object to create and manage histograms in a consistent and optimized way.
 
 ROOT provides an extensive list of histogram types. So why would one create a new interface? The reason is to offload histogram/object creation and management to the analysis framework and to allow with this for optimization. It is therefore recommended to use HistogramRegistry to create and work with histograms.