LHCb: Update DST/MDST collision record documentation

[dillfitz]

Now that a minimal usage guide has been created for using the Run 1 DST/MDSTs on the open data portal, we should update the corresponding records on the open data portal to point to the correct documentation.

I recommend changing the information displayed under the "How can you use these data?" heading as follows:

- The data collected by the LHCb detector is available in .DST and .mDST formats. The data files can be explored using LHCb software but it is best to write the relevant columns to ROOT Tuples or preferred data format.

- Instructions for exploring a DST and writing out ROOT tuples are available in LHCb Starterkit below. For "tupling" jobs, software called DaVinci is mainly used within LHCb, its documentation is also available bellow.

- [LHCb StarterKit](https://lhcb.github.io/starterkit-lessons/first-analysis-steps/minimal-dv-job.html)

- [DaVinci](https://lhcbdoc.web.cern.ch/lhcbdoc/davinci/)

- [Stripping lines index for stripping21r0p2](https://opendata.cern.ch/docs/stripping21r0p2-index) 


+ The data collected by the LHCb detector is available in .DST and .mDST formats. The data files can be explored using LHCb software but it is best to write the relevant columns to ROOT ntuples or a preferred data format.

+ Instructions for exploring a DST and writing out ROOT ntuples are available in the [LHCb Open Data Guide](https://lhcb-opendata-guide.web.cern.ch/run1-dsts-odp/).

+ A catalog for exploring the available stripping line selections can be found at the [stripping line index for stripping21r0p2](https://opendata.cern.ch/docs/stripping21r0p2-index). 

Note that for the last line, the link and link title depend on the stripping version of the record we are editing (in the example record I copied the text from, it is stripping21r0p2).

It would also be a nice feature if the links could open in a new tab rather than the current behavior, but this is not as important as the changes suggested above.

@tiborsimko let me know if you have any questions or suggestions. Thank you!