Merge pull request #2650 from CortexFoundation/dev

typo

Author: ucwong

ctxcdb/pebble/pebble.go

@@ -269,7 +269,7 @@ func New(file string, cache int, handles int, namespace string, readonly bool) (
 	// These two settings define the conditions under which compaction concurrency
 	// is increased. Specifically, one additional compaction job will be enabled when:
 	// - there is one more overlapping sub-level0;
-	// - there is an additional 512 MB of compaction debt;
+	// - there is an additional 256 MB of compaction debt;
 	//
 	// The maximum concurrency is still capped by MaxConcurrentCompactions, but with
 	// these settings compactions can scale up more readily.