Save several seconds on doc generation

Author: pirj

script/update_rubygems_and_install_bundler

@@ -6,7 +6,7 @@ set -e
 source script/functions.sh
 
 if is_ruby_23_plus; then
-  gem install bundler --conservative
+  gem install bundler --conservative --no-document
   gem update --system
 else
   echo "Warning installing older versions of Rubygems / Bundler"