Update 01-chapter2.markdown

Update line 503 and 522
Update 01-chapter1.markdown

修改错误拼写 Frenode -> Freenode
Merge pull request #699 from haway/master

[zh-tw] Update 01-chapter2.markdown
Merge pull request #700 from iahu/patch-1

Update 01-chapter1.markdown
Update 01-chapter9.markdown

correct the type mistake in the last line of section9.3
Merge pull request #701 from fuzhli/master

Update 01-chapter9.markdown
Update README

Fix typo.
Merge pull request #703 from YenaHong/patch-1

Update README