Add note that PASSING_RULE_OTHER should be used between non-drivable lanes

Signed-off-by: Thomas Bleher <thomas.tb.bleher@bmw.de>

Author: tbleher

osi_logicallane.proto

@@ -205,6 +205,10 @@ message LogicalLaneBoundary
         // Example: this type needs to be used if passing depends on the agent
         // type, e.g. if cars may change lane, but trucks may not.
         //
+        // This value is also used between non-drivable lanes where the traffic
+        // regulations do not say anything about passing rules (e.g. for a lane
+        // boundary between lanes of TYPE_BORDER and TYPE_SHOULDER).
+        //
         PASSING_RULE_OTHER = 1;
 
         // No passing is allowed (neither from left to right nor from right to