remove unnecessary parts from update doc

doc/update/7.3-to-7.4.md

@@ -52,31 +52,7 @@ sudo -u git -H bundle exec rake assets:clean assets:precompile cache:clear RAILS
 sudo cp lib/support/init.d/gitlab /etc/init.d/gitlab
 ```
 
-
-### 4. Configure Redis to use sockets
-
-    # Configure redis to use sockets
-    sudo cp /etc/redis/redis.conf /etc/redis/redis.conf.orig
-    # Disable Redis listening on TCP by setting 'port' to 0
-    sed 's/^port .*/port 0/' /etc/redis/redis.conf.orig | sudo tee /etc/redis/redis.conf
-    # Enable Redis socket for default Debian / Ubuntu path
-    echo 'unixsocket /var/run/redis/redis.sock' | sudo tee -a /etc/redis/redis.conf
-    # Be sure redis group can write to the socket, enable only if supported (>= redis 2.4.0).
-    sed -i '/# unixsocketperm/ s/^# unixsocketperm.*/unixsocketperm 0775/' /etc/redis/redis.conf
-    # Activate the changes to redis.conf
-    sudo service redis-server restart
-    # Add git to the redis group
-    sudo usermod -aG redis git
-
-    # Configure Redis connection settings
-    sudo -u git -H cp config/resque.yml.example config/resque.yml
-    # Change the Redis socket path if you are not using the default Debian / Ubuntu configuration
-    sudo -u git -H editor config/resque.yml
-
-    # Configure gitlab-shell to use Redis sockets
-    sudo -u git -H sed -i 's|^  # socket.*|  socket: /var/run/redis/redis.sock|' /home/git/gitlab-shell/config.yml
-
-### 5. Update config files
+### 4. Update config files
 
 #### New configuration options for gitlab.yml
 
@@ -102,12 +78,12 @@ sudo -u git -H editor config/unicorn.rb
 * Add `collation: utf8_general_ci` to config/database.yml as seen in [config/database.yml.mysql](config/database.yml.mysql)
 
 
-### 6. Start application
+### 5. Start application
 
     sudo service gitlab start
     sudo service nginx restart
 
-### 7. Check application status
+### 6. Check application status
 
 Check if GitLab and its environment are configured correctly:
 
@@ -119,13 +95,8 @@ To make sure you didn't miss anything run a more thorough check with:
 
 If all items are green, then congratulations upgrade is complete!
 
-### 8. Update OmniAuth configuration
-
-When using Google omniauth login, changes of the Google account required.
-Ensure that `Contacts API` and the `Google+ API` are enabled in the [Google Developers Console](https://console.developers.google.com/).
-More details can be found at the [integration documentation](../integration/google.md).
 
-### 9. Optional optimizations for GitLab setups with MySQL databases
+### 7. Optional optimizations for GitLab setups with MySQL databases
 
 Only applies if running MySQL database created with GitLab 6.7 or earlier. If you are not experiencing any issues you may not need the following instructions however following them will bring your database in line with the latest recommended installation configuration and help avoid future issues. Be sure to follow these directions exactly. These directions should be safe for any MySQL instance but to be sure make a current MySQL database backup beforehand.