Codespell report for "leveldb" (on fossies.org)

There were four small typos found in the current "leveldb" release, hardly worth mentioning especially since only in code comments and not user visible, but still:

 https://fossies.org/linux/misc/leveldb/codespell.html

OT: By the way, on that server is also [Doxygen](https://www.doxygen.org/) generated source code documentation available, but its configuration was only slightly adapted to the "leveldb" project so I'm not sure if it's really useful:

 https://fossies.org/dox/leveldb