Revert "[doc] default,256m -> malloc,256m"
Revert "[doc] default,256m -> malloc,256m"

This reverts commit 83425a059ac9a292b8909a2d3a58aa2c35c5d769.

gquintard/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache