Update the name tags tutorial to include Tag elements

[jennaj]

We should update this tutorial

https://training.galaxyproject.org/training-material/topics/galaxy-interface/tutorials/name-tags/tutorial.html

to include the Tag elements tool.

We could even just cross link to the example in the tag-based analysis approach in this tutorial section

https://training.galaxyproject.org/training-material/topics/transcriptomics/tutorials/ref-based/tutorial.html#hands-on-choose-your-own-tutorial-1

Or, abstract into a snippet? Open to ideas. We do have an FAQ here but it doesn't mention the dedicated tool either. Maybe putting all of these together is the solution.

https://training.galaxyproject.org/training-material/faqs/galaxy/datasets_add_tag.html

What do you think @mvdbeek ?

This came up in Q&A at the forum, see https://help.galaxyproject.org/t/14708/4