Added specification of F to the user documentation for pair.table.
Added specification of F to the user documentation for pair.table.

git-svn-id: 48954c6e26992100b6540c72de2182435306000e@2106 fa922fa7-2fde-0310-acd8-f43f465a7996

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue