[nl] Chapter 09 - Review and retranslate where necessary.
Update 01-chapter3.markdown

simple typo: Du kann mehrere Branches -> Du kannst mehrere Branches
Merge pull request #687 from Sicaine/patch-1

Update 01-chapter3.markdown
Merge pull request #686 from Cpt-xx/chapter09

[nl] Chapter 09 - Review and retranslate where necessary.