Add example for getting name of species/parameters

[oxinabox]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• x ] All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API
  ??? idk

Additional context

Closes #1325

[TorkelE]

Looks good. In practise the section probably doesn't really belong in the DSL bit. The best would probably be to list this and other relavant functions in the API after this: https://docs.sciml.ai/Catalyst/stable/api/core_api/#Basic-species-properties, and then we can link to it after where we introduce symbolic variables (e.g. here and here).

Not suggesting that you have to do it, happy to add it myself.

[oxinabox]

yeah i thought about putting it there but couldn't workout exactly where it fit neatly

[TorkelE]

yeah, the docs have grown a lot so it is quite hard to figure out, but now we have the text which is the important bit. I'll push changes to this PR and finish it of (if you are happy with that).

[oxinabox]

sounds good