Summary:
Minor issue, I just found a few typos on db_test and column_family while reading the code. And I have this PR opened to contribute.  :)

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10139

Reviewed By: ajkr

Differential Revision: D38007098

Pulled By: jay-zhuang

fbshipit-source-id: 511947b32424c34348184691216640f32c410fb1