[ja] Sync with a0c9cd916ab2bd5a4768c6b39f3fe84c87558898 , 424d59b868f83d02a12be347a64ef3036ca6c476

Adding new stub shortcuts to 4.0 docs
[ja] Sync with f3a1bf6ef3dcb1900c05d06982f830f2e100bcd4

Replace `Object_Freezer` with `Moneny`.
[ja] Sync with d70c52b6d468f383ed1ae0fc66052e99f9855272

Added a note about what constitutes a valid doc comment.