Merge the following from the English version. And
- Rewrap lines and some small changes related to rewrapping.
- Punctuation character transition.
- Translate title entity.
- Some modifications.
features.sgml 1.23 -> 1.29
Submitted by: Hiroki Kobayashi <solidsneak at hyper dot cx>
Reviewed by: Hiroo Ono <hiroo _at_ jp dot FreeBSD dot org>, ryusuke
References: [doc-jp-work 1441, 1460, 1470, 1482, 2038]
Approved by: hrs (mentor)