vsphere_guest module doc fix
Update playbooks_variables.rst

very small and minor addition, but I couldn't find anywhere that answered this (now obvious) question I had of whether or not facts could also be yaml files.
Merge pull request #8973 from sergevanginderachter/vsphere_guest_docfix

vsphere_guest module doc fix
Merge pull request #8976 from nullren/patch-1

Update playbooks_variables.rst