[Tile-serving] [osm2pgsql] Add documentation to id_tracker (#426)

[Paul Norman]

This is based on @zerebubuth's comments in
https://github.com/openstreetmap/osm2pgsql/commit/aa1ff6e5d07b7a356bc88093d2673fc7929c2133#commitcomment-10961958
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/426

-- Commit Summary --

  * Add documentation to id_tracker

-- File Changes --

    M id-tracker.hpp (17)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/426.patch
https://github.com/openstreetmap/osm2pgsql/pull/426.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/426
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