Fix reST in 1.0 porting guide.
|Reported by:||Adam Vandenberg||Owned by:||nobody|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
There is some incorrect reST in the 0.96 to 1.0 porting guide.
(I won't not be sad if this was resolved "won't fix"; it is offered for completeness.)