Ziyue Yang 0c2d71edba Fix typo: replace readadhead with readahead (#7953)
Summary:
This PR replaces several "readadhead" typos with "readahead".

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7953

Reviewed By: ajkr

Differential Revision: D26518903

Pulled By: jay-zhuang

fbshipit-source-id: 6f7dece0e39ec4f71c4a936399bcb2e02574f42a
2021-02-18 14:31:20 -08:00
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