Fix 6.3 branch name

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

doc/update/6.2-to-6.3.md

@@ -21,7 +21,7 @@ sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production
 ```bash
 cd /home/git/gitlab
 sudo -u git -H git fetch
-sudo -u git -H git checkout 6.3-stable
+sudo -u git -H git checkout 6-3-stable
 ```
 ### 3. Update gitlab-shell
@@ -62,11 +62,11 @@ sudo -u git -H bundle exec rake cache:clear RAILS_ENV=production
 TIP: to see what changed in gitlab.yml.example in this release use next command: 
 ```
-git diff 6.2-stable:config/gitlab.yml.example 6.3-stable:config/gitlab.yml.example
+git diff 6.2-stable:config/gitlab.yml.example 6-3-stable:config/gitlab.yml.example
 ```
-* Make `/home/git/gitlab/config/gitlab.yml` same as https://github.com/gitlabhq/gitlabhq/blob/6.3-stable/config/gitlab.yml.example but with your settings.
-* Make `/home/git/gitlab/config/unicorn.rb` same as https://github.com/gitlabhq/gitlabhq/blob/6.3-stable/config/unicorn.rb.example but with your settings.
+* Make `/home/git/gitlab/config/gitlab.yml` same as https://github.com/gitlabhq/gitlabhq/blob/6-3-stable/config/gitlab.yml.example but with your settings.
+* Make `/home/git/gitlab/config/unicorn.rb` same as https://github.com/gitlabhq/gitlabhq/blob/6-3-stable/config/unicorn.rb.example but with your settings.
 * Copy rack attack middleware config
 ```bash
@@ -82,7 +82,7 @@ sudo cp lib/support/logrotate/gitlab /etc/logrotate.d/gitlab
 ```bash
 sudo rm /etc/init.d/gitlab
-sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlabhq/6.3-stable/lib/support/init.d/gitlab
+sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlabhq/6-3-stable/lib/support/init.d/gitlab
 sudo chmod +x /etc/init.d/gitlab
 ```