[openstreetmap/openstreetmap-website] Add link to read changeset comment notifications (#2377)

[Andy Allan]

See my comment at https://github.com/openstreetmap/openstreetmap-website/issues/2102#issuecomment-474798118

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https://github.com/openstreetmap/openstreetmap-website/issues/2377#issuecomment-536321462
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