doc/issue_tracker: theres no substatus in trac

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
doc/issue_tracker: remove patches as we dont use trac to handle patches

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
doc/issue_tracker: update resolution names

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>