move the update guides from the wiki into the repo

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diff --git a/doc/update/4.1-to-4.2.md b/doc/update/4.1-to-4.2.md
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+# From 4.1 to 4.2
+
+### 1. Stop server & resque
+
+    sudo service gitlab stop
+
+### 2. Update code & db
+
+```bash
+# Get latest code
+sudo -u gitlab git fetch
+
+sudo -u gitlab git checkout 4-2-stable
+
+# Install libs
+sudo -u gitlab bundle install --without development test postgres --deployment
+
+# update db
+sudo -u gitlab bundle exec rake db:migrate RAILS_ENV=production
+
+```
+
+
+### 3. Check GitLab's status
+
+```bash
+sudo -u gitlab -H bundle exec rake gitlab:check RAILS_ENV=production
+```
+
+
+
+### 4. Start all
+
+    sudo service gitlab start