branches.md: Fix URL for mellanox and multiproc
branches.md: Fix URL for mellanox and multiproc

dpino/snabbswitch,snabbco/snabb,Igalia/snabb,wingo/snabbswitch,dpino/snabb,eugeneia/snabb,Igalia/snabbswitch,wingo/snabbswitch,kbara/snabb,kbara/snabb,snabbco/snabb,mixflowtech/logsensor,snabbco/snabb,dpino/snabb,dpino/snabb,Igalia/snabbswitch,alexandergall/snabbswitch,heryii/snabb,snabbco/snabb,alexandergall/snabbswitch,dpino/snabbswitch,dpino/snabb,Igalia/snabbswitch,eugeneia/snabb,snabbco/snabb,kbara/snabb,eugeneia/snabb,wingo/snabb,wingo/snabb,SnabbCo/snabbswitch,eugeneia/snabb,SnabbCo/snabbswitch,alexandergall/snabbswitch,Igalia/snabb,mixflowtech/logsensor,eugeneia/snabb,Igalia/snabb,dpino/snabb,snabbco/snabb,SnabbCo/snabbswitch,wingo/snabbswitch,Igalia/snabb,mixflowtech/logsensor,eugeneia/snabbswitch,eugeneia/snabbswitch,kbara/snabb,snabbco/snabb,eugeneia/snabb,mixflowtech/logsensor,mixflowtech/logsensor,dpino/snabbswitch,heryii/snabb,SnabbCo/snabbswitch,alexandergall/snabbswitch,wingo/snabb,Igalia/snabbswitch,eugeneia/snabbswitch,wingo/snabb,eugeneia/snabbswitch,Igalia/snabbswitch,heryii/snabb,wingo/snabb,eugeneia/snabb,Igalia/snabb,wingo/snabb,alexandergall/snabbswitch,heryii/snabb,dpino/snabb,alexandergall/snabbswitch,wingo/snabbswitch,eugeneia/snabb,dpino/snabbswitch,Igalia/snabb,heryii/snabb,alexandergall/snabbswitch,snabbco/snabb,Igalia/snabb,kbara/snabb,dpino/snabb,Igalia/snabb,kbara/snabb,alexandergall/snabbswitch,heryii/snabb