Add term to shop=stationery to prevent misspelling

[matkoniecz]

Description, Motivation & Context

For some reason "stationary" is a very common misspelling of "stationery"

this specific one was triggered by Zverik/every_door#880 cleanup but I have seen it in many other places

I think that misspelling as terms is likely to be controversial - but it makes sense to do so

Related issues

None

Links and data

Relevant OSM Wiki links:

https://wiki.openstreetmap.org/wiki/Mechanical_Edits/Mateusz_Konieczny_-_bot_account/fixing_malformed_shop_tags (as it explains why shop=stationary is not currently appearing in OSM database

Relevant tag usage stats:

…

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- [ ] American English
- [ ] `name`, `aliases` (if present) use Title Case
- [ ] `terms` (if present) use lower case, sorted A-Z
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[tordans]

The preview is gone by now so I cannot easily double check if this has the desired effect … but it should have and the change is small enough to merge as is IMO.