Fix `operator.checkpoint.remove` default on doc
Fix `operator.checkpoint.remove` default on doc

asakusafw/asakusafw-m3bp,asakusafw/asakusafw-m3bp,ashigeru/asakusafw-m3bp,ashigeru/asakusafw-m3bp,ashigeru/asakusafw-m3bp,asakusafw/asakusafw-m3bp