[Tagging] Deprecating notes key - mostly imported duplicate of note key

[Mateusz Konieczny]

I marked it as deprecated in Wiki and 
I think about optimal way to migrate itto note tag, where note tag is not yet 
present.

(1) By bot editor(2) By validator rules in iD and JOSM

29 Jan 2021, 09:13 by tagging at openstreetmap.org:

> See > https://wiki.openstreetmap.org/wiki/Key:notes
>
> Note that vast majority of uses of that tag comes from imports
> ( note sudden jumps in > https://taginfo.openstreetmap.org/keys/notes#chronology>  )
>
> Most of the uses are a single note and even in cases where there are multiple notes,
> note tag is still preferable due to it being standard and with support in multiple editors.
>
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