Broken link in HS3 printout

[mmikhasenko]

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Description

A minor note on warning message from HS3 suggest non-existing page,
https://github.com/root-project/root/blob/master/roofit/hs3/README.md

Full message

unable to export class 'RooBreitWigner' - no export keys available!
there are several possible reasons for this:
 1. RooBreitWigner is a custom class that you or some package you are using added.
 2. RooBreitWigner is a ROOT class that nobody ever bothered to write a serialization definition for.
 3. something is wrong with your setup, e.g. you might have called RooFit::JSONIO::clearExportKeys() and/or never successfully read a file defining these keys with RooFit::JSONIO::loadExportKeys(filename)
either way, please make sure that:
 3: you are reading a file with export keys - call RooFit::JSONIO::printExportKeys() to see what is available
 2 & 1: you might need to write a serialization definition yourself. check https://github.com/root-project/root/blob/master/roofit/hs3/README.md to see how to do this!
(int) 0

Reproducer

1. Use the latest root,
   source /cvmfs/sft.cern.ch/lcg/views/dev3/latest/x86_64-el9-gcc13-opt/setup.sh

2. run a script, root -l -b -q export_pdf.cxx++

#include "RooRealVar.h"
#include "RooBreitWigner.h"
#include "RooWorkspace.h"
#include "RooFitHS3/RooJSONFactoryWSTool.h"

int export_pdf()
{
    RooRealVar x("x", "x", -10, 10);
    RooRealVar mean("mean", "mean of gaussian", 1, -10, 10);
    RooRealVar gamma("gamma", "width of bw", 1, 0.1, 10);
    RooBreitWigner bw("bw", "non-rel bw", x, mean, gamma);

    RooWorkspace w("ws");
    w.import(bw);

    RooJSONFactoryWSTool tool(w);
    tool.exportJSON("standard_pdf.json");
    return 0;
}

ROOT version

root --version
ROOT Version: 6.33/01
Built for linuxx8664gcc on Apr 26 2024, 23:06:35
From heads/master@v6-31-01-1819-gb5ad658677

Installation method

LCG

Operating system

Linux

Additional context

No response

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖

[github-actions]

Hi @guitargeek,

It appears this issue is closed, but wasn't yet added to a project. Please add upcoming versions that will include the fix, or 'not applicable' otherwise.

Sincerely,
🤖