Add a default_description in windows_task
Add a default_description in windows_task

This came up in https://github.com/chef/chef-web-docs/pull/2256 and we
should really be documenting that behavior here so we can generate the
docs with it.

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

higanworks/chef,higanworks/chef,higanworks/chef,gene1wood/chef,jaymzh/chef,chef/chef,jaymzh/chef,higanworks/chef,mattray/chef,nvwls/chef,nvwls/chef,tas50/chef-1,mattray/chef,chef/chef,gene1wood/chef,tas50/chef-1,chef/chef,nvwls/chef,mwrock/chef,tas50/chef-1,MsysTechnologiesllc/chef,gene1wood/chef,mwrock/chef,mwrock/chef,jaymzh/chef,MsysTechnologiesllc/chef,mattray/chef,jaymzh/chef,nvwls/chef,chef/chef,mwrock/chef,mattray/chef,tas50/chef-1,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,nvwls/chef,gene1wood/chef,mattray/chef,nvwls/chef,higanworks/chef