Revert "src/README.md: improve docs of core packet ops that clobber their input value"
Revert "src/README.md: improve docs of core packet ops that clobber their input value"

This reverts commit f0b2060c6fe18a7113fbd724388d5578412cb8d1.

dpino/snabbswitch,SnabbCo/snabbswitch,snabbco/snabb,eugeneia/snabbswitch,Igalia/snabbswitch,dpino/snabb,Igalia/snabb,SnabbCo/snabbswitch,Igalia/snabb,Igalia/snabb,snabbco/snabb,SnabbCo/snabbswitch,dpino/snabbswitch,Igalia/snabbswitch,eugeneia/snabb,snabbco/snabb,dpino/snabb,eugeneia/snabbswitch,Igalia/snabb,dpino/snabb,dpino/snabbswitch,SnabbCo/snabbswitch,eugeneia/snabb,dpino/snabb,eugeneia/snabb,Igalia/snabb,eugeneia/snabbswitch,eugeneia/snabb,alexandergall/snabbswitch,dpino/snabb,dpino/snabbswitch,snabbco/snabb,alexandergall/snabbswitch,alexandergall/snabbswitch,eugeneia/snabbswitch,Igalia/snabb,eugeneia/snabb,Igalia/snabb,alexandergall/snabbswitch,snabbco/snabb,Igalia/snabbswitch,alexandergall/snabbswitch,eugeneia/snabb,Igalia/snabbswitch,dpino/snabb,alexandergall/snabbswitch,eugeneia/snabb,snabbco/snabb,Igalia/snabbswitch,snabbco/snabb,snabbco/snabb,alexandergall/snabbswitch,eugeneia/snabb,Igalia/snabb,alexandergall/snabbswitch,dpino/snabb