Amend ADR 0002 to include comments related to feedstock repository creation

[ciaransweet]

Whilst working on the feedstock-creation-action we have come across some assumptions that need to be outlined in the ADR.

Namely these assumptions are:

• The generated feedstock repository will hold meta.yaml and the Recipe related files in a top level directory called feedstock/
• The feedstock-creation-action will deem any files directly adjacent or in subdirectories directly adjacent to the meta.yaml file in the staged-recipes PR to be necessary for the feedstocks successful administration and will therefore all be included in the generated repository

Please let me know if we'd rather make a new ADR for this, I just felt like it fell more into the remit of 0002.

[rabernat]

Sorry for the slow merge on this!