Fixed some typos in the comments of rocksdb options file example
Fixed some typos in the comments of rocksdb options file example

Summary: Fixed some typos in the comments of rocksdb options file example

Test Plan: No code change.

Reviewers: igor, anthony, IslamAbdelRahman, rven, kradhakrishnan, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D51393

wat-ze-hex/rocksdb,ryneli/rocksdb,facebook/rocksdb,Vaisman/rocksdb,hobinyoon/rocksdb,SunguckLee/RocksDB,wenduo/rocksdb,wenduo/rocksdb,SunguckLee/RocksDB,OverlordQ/rocksdb,flabby/rocksdb,vmx/rocksdb,flabby/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,norton/rocksdb,ryneli/rocksdb,bbiao/rocksdb,Vaisman/rocksdb,wat-ze-hex/rocksdb,tsheasha/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,norton/rocksdb,bbiao/rocksdb,norton/rocksdb,Vaisman/rocksdb,wat-ze-hex/rocksdb,ryneli/rocksdb,hobinyoon/rocksdb,norton/rocksdb,Andymic/rocksdb,jalexanderqed/rocksdb,facebook/rocksdb,norton/rocksdb,facebook/rocksdb,SunguckLee/RocksDB,vmx/rocksdb,tsheasha/rocksdb,norton/rocksdb,wenduo/rocksdb,flabby/rocksdb,jalexanderqed/rocksdb,wenduo/rocksdb,ryneli/rocksdb,Vaisman/rocksdb,hobinyoon/rocksdb,SunguckLee/RocksDB,flabby/rocksdb,Andymic/rocksdb,wat-ze-hex/rocksdb,SunguckLee/RocksDB,Andymic/rocksdb,wenduo/rocksdb,OverlordQ/rocksdb,OverlordQ/rocksdb,facebook/rocksdb,bbiao/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,wenduo/rocksdb,vmx/rocksdb,hobinyoon/rocksdb,vmx/rocksdb,wat-ze-hex/rocksdb,vmx/rocksdb,jalexanderqed/rocksdb,flabby/rocksdb,wenduo/rocksdb,bbiao/rocksdb,Vaisman/rocksdb,bbiao/rocksdb,ryneli/rocksdb,vmx/rocksdb,Vaisman/rocksdb,facebook/rocksdb,Andymic/rocksdb,wat-ze-hex/rocksdb,OverlordQ/rocksdb,Vaisman/rocksdb,facebook/rocksdb,ryneli/rocksdb,wat-ze-hex/rocksdb,Andymic/rocksdb,tsheasha/rocksdb,ryneli/rocksdb,hobinyoon/rocksdb,tsheasha/rocksdb,jalexanderqed/rocksdb,wat-ze-hex/rocksdb,facebook/rocksdb,Andymic/rocksdb,norton/rocksdb,bbiao/rocksdb,jalexanderqed/rocksdb,jalexanderqed/rocksdb,OverlordQ/rocksdb,wenduo/rocksdb,hobinyoon/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,bbiao/rocksdb,Andymic/rocksdb,flabby/rocksdb,facebook/rocksdb,OverlordQ/rocksdb,norton/rocksdb,OverlordQ/rocksdb,jalexanderqed/rocksdb,flabby/rocksdb,vmx/rocksdb,Andymic/rocksdb,tsheasha/rocksdb