dbus: policy comment predates the per-sender uid lookup

It still described treating every system-bus caller as unprivileged as
the state of things, which stopped being true when Finit learned to ask
the broker who sent a call.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

dbus-1/org.finit.conf

@@ -11,10 +11,10 @@
   every state-changing method at the broker.  finit *also* enforces
   per-method authorisation itself (LINK_METHOD_PRIVILEGED), so
   defense-in-depth: even if a permissive policy is installed by
-  mistake, finit rejects unprivileged state changes via SO_PEERCRED
+  mistake, finit rejects unprivileged state changes.  It reads the
-  on the local bus and by treating every system-bus caller as
+  caller from SO_PEERCRED on the local bus, and on the system bus it
-  unprivileged (peer_uid = (uid_t)-1) until a per-sender uid lookup
+  asks the broker who sent each privileged call, via
-  via GetConnectionUnixUser is implemented.
+  GetConnectionUnixUser.
 -->
 <busconfig>