[Tagging] Ethnic shops

[Eric SIBERT]

I started modifying the wiki following our recent discussion.

For cuisine=*, I added:
"May also apply to other services that deliver food, like convenience."

For shop=convenience, I added (in Tags used in combination):
"Stores selling specific type of food or with ethnic origin may use 
{{tag|cuisine}} to indicate it."


And latter go on with culture=* for nonfood services?

Eric