[Tile-serving] [osm2pgsql] Add missing text in --drop docs (#214)

[Paul Norman]

Fixes #209
You can merge this Pull Request by running:

  git pull https://github.com/pnorman/osm2pgsql drop_usage

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/osm2pgsql/pull/214

-- Commit Summary --

  * Add missing text in --drop docs

-- File Changes --

    M docs/usage.md (3)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/214.patch
https://github.com/openstreetmap/osm2pgsql/pull/214.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/214
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