Fix documentation and update method comment

docs/internal/blob-api.md

@@ -86,7 +86,7 @@ BLOB対応の方針変更により、以下のクラスを廃止しました。
 
 BLOB対応の方針変更により、以下のメソッドを廃止しました。
 
-*  `std::vector<large_object_view>& large_objects();`
+*  `std::vector<large_object_view>& datastore::large_objects();`
 
 
 

include/limestone/api/datastore.h

@@ -273,7 +273,8 @@ class datastore {
      * @brief change the available boundary version that the entries may be read.
      * @details This version comprises the oldest accessible snapshot, that is,
      *    the datastore may delete anything older than the version included in this snapshot.
-     * @param version the target boundary version
+     * @details The boundary version must be monotonic, that is,
+     *    it must be greater than or equal to the previous boundary version.     * @param version the target boundary version
      * @attention this function should be called after the ready() is called.
      * @see switch_safe_snapshot()
      * @note the specified version must be smaller than or equal to the version that was told by the switch_safe_snapshot().