[Tagging] Marking waterway=brook as deprecated and problematic

[Mateusz Konieczny]

waterway=brook has minimal use and plenty of issues

See https://wiki.openstreetmap.org/wiki/Tag:waterway%3Dbrook
https://wiki.openstreetmap.org/wiki/Talk:Tag:waterway%3Dbrook

Therefore I marked it as deprecated.

If anyone has counterarguments to any of issues raised in 2015 - it is a good moment
to raise them.
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