docs: formatdomain: Mention missing protocols
docs: formatdomain: Mention missing protocols

http, https, ftp, ftps, and tftp were not mentioned in the
documentation. Note that 'ssh' is still omitted as it's used only
internally.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

jardasgit/libvirt,olafhering/libvirt,libvirt/libvirt,zippy2/libvirt,jfehlig/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,crobinso/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,crobinso/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt,jardasgit/libvirt,crobinso/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,nertpinx/libvirt,jardasgit/libvirt,jardasgit/libvirt,olafhering/libvirt,fabianfreyer/libvirt