modify a chinese character in 01-chapter7.markdown

石 --> 是
Update 01-chapter5.markdown

"e" manquant.
fix a minor problem
Merge pull request #493 from chzju/master

[zh] update chapter 9
Merge pull request #491 from AngleMortSociety/patch-1

Update 01-chapter5.markdown
Merge pull request #490 from hex636b/master

modify a chinese character in 01-chapter7.markdown
Merge pull request #489 from GArik/EN

Fix incorrect example in "diffing binary files" section
[ru] chapter 7: Extend/improve "Diffing Binary Files" section
[ru] chapter 7: Translate figures.
[ru] chapter 3: Translate some figures.