Fix typo in comment (#11617)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/11617

Test Plan: make check

Reviewed By: ajkr

Differential Revision: D47599209

Pulled By: jowlyzhang

fbshipit-source-id: 00e96266c75128875663083a2877d27fd7392eea

include/rocksdb/options.h

@@ -1071,7 +1071,7 @@ struct DBOptions {
   //
   // By default, i.e., when it is false, rocksdb does not advance the sequence
   // number for new snapshots unless all the writes with lower sequence numbers
-  // are already finished. This provides the immutability that we except from
+  // are already finished. This provides the immutability that we expect from
   // snapshots. Moreover, since Iterator and MultiGet internally depend on
   // snapshots, the snapshot immutability results into Iterator and MultiGet
   // offering consistent-point-in-time view. If set to true, although