relnote: clarify the backward compatibility entry about p1/p2 swap
The previous message might read a bit scary. So we clarify that the nodeid are
not affected.
Differential Revision: https://phab.mercurial-scm.org/D10496
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}