fix typo for git daemon export flag file

Spotted by Joseph P. SKUDLAREK. The file name is git-daemon-export-ok
instead of  git-export-daemon-ok.
Merge branch 'git-daemon-export-ok'
Update 01-chapter1.markdown

forget an letter
Fix typo on git-daemon-export-ok

It's daemon, not deamon, dammit!
Merge pull request #619 from Atrono/patch-1

Update 01-chapter1.markdown