update release notes

README/ReleaseNotes/v634/index.md

@@ -139,7 +139,7 @@ The [TUnfold package](https://www.desy.de/~sschmitt/tunfold.html) inside ROOT is
 
 ## Math Libraries
 
-### Minuit2 
+### Minuit2
 
 * **Usage of `std::span<const double>`in the interface**: To avoid forcing the user to do manual memory allocations via `std::vector`, the interfaces of Minuit 2 function adapter classes like `ROOT::Minuit2::FCNBase` or `ROOT::Minuit2::FCNGradientBase` were changed to accept `std::span<const double>` arguments instead of `std::vector<double> const&`.
 This should have minimal impact on users, since one should usual use Minuit 2 via the `ROOT::Math::Minimizer` interface, which is unchanged.
@@ -158,6 +158,8 @@ This should have minimal impact on users, since one should usual use Minuit 2 vi
 
 * Initial error values can be used for initializating the Hessian matrix to be used in Minuit2 minimization algorithms by setting the `RooMinimizer::Config` option `setInitialCovariance` to `true`. These values correspond to the diagonal entries of the initial covariance matrix.
 
+* `THStack:GetMinimum()` was not correct in case of negative contents.
+
 ### Deprecations
 
 * The `RooStats::MarkovChain::GetAsDataSet` and `RooStats::MarkovChain::GetAsDataHist` functions are deprecated and will be removed in ROOT 6.36. The same functionality can be implemented by calling `RooAbsData::reduce` on the Markov Chain's `RooDataSet*` (obtained using `MarkovChain::GetAsConstDataSet`) and then obtaining its binned clone(for `RooDataHist`).
@@ -223,7 +225,18 @@ TCanvas::SaveAll({c1, c2, c3, c4}, "file.pdf");
 ```
 
 ## 2D Graphics Libraries
+* In `TGraphErrors` `TGraphAsymmErrors` and `TGraphBentErrors`, the error bars were drawn
+  inside the marker when the marker was bigger than the error bars. This produced a weird
+  plot. This is now fixed.
+
+ When error-bars exceeded the y range limits the end of error bars were nevertheless displayed
+  on the x-bottom and top axis. So it looked like the total error bar while it was indeed not.
+
+* New color schemes have been implemented as described [here](https://root.cern.ch/blog/new-color-schemes/).
+
+* Implement properly the TScatter palette attributes as requested [here](https://github.com/root-project/root/issues/15922).
 
+* Add `TStyle::SetLegendFillStyle`
 
 ## 3D Graphics Libraries
 
@@ -326,6 +339,8 @@ JSROOT is now used as default display in `jupyter`.
 
 ## Tutorials
 
+* New tutorials [accessiblecolorschemes.C](https://root.cern/doc/master/accessiblecolorschemes_8C.html)
+  and [hstackcolorscheme.C](https://root.cern/doc/master/thstackcolorscheme_8C.html).
 
 ## Class Reference Guide