clarify docs

Author: DracoLi

x/blockdb/cache_db.go

@@ -17,7 +17,7 @@ var _ database.HeightIndex = (*cacheDB)(nil)
 // cacheDB caches data from the underlying [Database].
 //
 // Operations (Get, Has, Put) are not atomic with the underlying database.
-// Concurrent access to the same height can result in cache inconsistencies where
+// Concurrent writes to the same height can result in cache inconsistencies where
 // the cache and database contain different values. This limitation is acceptable
 // because concurrent writes to the same height are not an intended use case.
 type cacheDB struct {