Fix info_log comment in SSTFileManager (#11530)

Summary:
**Context/Summary:** as title

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11530

Test Plan: no code change

Reviewed By: jowlyzhang

Differential Revision: D46655670

Pulled By: hx235

fbshipit-source-id: 3dfea5485a9a6a8ce0de1f6296c4cf31aedfa116

include/rocksdb/sst_file_manager.h

@@ -93,7 +93,8 @@ class SstFileManager {
 //
 // @param env: Pointer to Env object, please see "rocksdb/env.h".
 // @param fs: Pointer to FileSystem object (rocksdb/file_system.h"
-// @param info_log: If not nullptr, info_log will be used to log errors.
+// @param info_log: If not nullptr, info_log will be used to log messages of
+// INFO, WARN or ERROR level with respect to info_log's info level.
 //
 // == Deletion rate limiting specific arguments ==
 // @param trash_dir: Deprecated, this argument have no effect