Fix typo about file/sst_file_manager_impl.h (#9799)

Summary:
Fix typo deletition-> deletion

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9799

Reviewed By: ajkr

Differential Revision: D35341617

Pulled By: jay-zhuang

fbshipit-source-id: 32bc384b99e5564f6a673076c6a4f160ee6c2e46

file/sst_file_manager_impl.h

@@ -166,7 +166,7 @@ class SstFileManagerImpl : public SstFileManager {
   std::unordered_map<std::string, uint64_t> tracked_files_;
   // The maximum allowed space (in bytes) for sst and blob files.
   uint64_t max_allowed_space_;
-  // DeleteScheduler used to throttle file deletition.
+  // DeleteScheduler used to throttle file deletion.
   DeleteScheduler delete_scheduler_;
   port::CondVar cv_;
   // Flag to force error recovery thread to exit