backport 44936fd to other language and pdf

This change needs to be backported to all languages. The pdf toolchain
processes this formula with a transformation to some latex mathematic
typesetting and therefore needs to be updated.
Update 01-chapter3.markdown
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
Added placeholder and first chapter (only Getting Started) for Hindi (hi) translation of the book.
Added a paragraph in chapter 1.
Use English "control".
Merge pull request #707 from nishantshreshth/master

Hindi translation placeholder and first file.
Fix typo 'ful' to 'full'
Merge pull request #708 from lijunle/master

Fix typo 'ful' to 'full'
[zh] Update chapter 1. Translate one paragraph to Chinese.
Update 01-chapter1.markdown

diverse typo's gecorrigeerd
Update 01-chapter2.markdown

diverse typo's gecorrigeerd
voor wat betreft spatiecorrecties, zie ook www.spatiegebruik.nl
Update 01-chapter3.markdown

diverse typo's gecorrigeerd
Nagezien tot aan Figuur 3-14.