[component][filesystem]Fix filesystem component doc#2341

Merged

weaverryan merged 2 commits intosymfony:2.1from

77web:fix-filesystem-component-doc

Mar 30, 2013

Commits on Mar 23, 2013

[components/filesystem]fixed chmod's sequence number of recursive argument
77web
committed
[components/filesystem]fixed description for copy's third argument according to actual code
77web
committed