[翻訳]Fix minor issues in meta tag

- 対応する英語版は以下の通り
https://github.com/dsyph3r/symblog-docs/commit/f5dab5b2ea17d5adf7d1efd2f524cc33eba8733d#diff-dedd7c301b144c5a7d88e3b0413a0dd3
Merge pull request #7 from kseta/fix-cp1

[翻訳][Part1]67ee56e9b3まで更新