Describe unicorn timeout value in git over http

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

config/unicorn.rb.example

@@ -34,6 +34,20 @@ listen "/home/git/gitlab/tmp/sockets/gitlab.socket", :backlog => 64
 listen "127.0.0.1:8080", :tcp_nopush => true
 
 # nuke workers after 30 seconds instead of 60 seconds (the default)
+#
+# NOTICE: git push over http depends on this value. 
+# If you want be able to push huge amount of data to git repository over http 
+# you will have to increase this value too. 
+# 
+# Example of output if you try to push 1GB repo to GitLab over http.
+#   -> git push http://gitlab.... master
+#
+#   error: RPC failed; result=18, HTTP code = 200
+#   fatal: The remote end hung up unexpectedly
+#   fatal: The remote end hung up unexpectedly
+#
+# For more information see http://stackoverflow.com/a/21682112/752049
+#
 timeout 30
 
 # feel free to point this anywhere accessible on the filesystem