Fix typos
Merge pull request #37 from changwoo/ko

오타 수정
[ko] remove a slang.
Markup fix.
[zh] Sync with English version.
Merge pull request #771 from xfq/zh-translation

[zh] Sync with English version.
[ko] update translation
Markup fixes.
Merge pull request #775 from larrys/formatfixes

Markup fixes.
Merge pull request #774 from dogfeet/ko

[ko] update translation.
[zh] Synchronize with English version.
Merge pull request #776 from xfq/zh-translation

[zh] Synchronize with English version.
[zh] Fix a small typo in 01-chapter5
Merge pull request #778 from lord63/master

[zh] Fix a small typo in 01-chapter5