Fix update-docs script

docs/update-docs.sh

@@ -5,5 +5,5 @@ cp assets/CNAME _book/CNAME
 cd _book
 git init
 git add -A
-git commit -m 'update book'
-git push -f git@github.com:OHIF/Viewers/.git master:gh-pages
+git commit -m 'Update compiled GitBook (this commit is automatic)'
+git push -f git@github.com:OHIF/Viewers.git master:gh-pages