Remove reference to JIRA ticket in comments

CURA-7646

cura/Settings/CuraStackBuilder.py

@@ -68,7 +68,7 @@ class CuraStackBuilder:
 
         # If given, set the machine_extruder_count when creating the machine, or else the extruderList used bellow will
         # not return the correct extruder list (since by default, the machine_extruder_count is 1) in machines with
-        # settable number of extruders. See CURA-7646.
+        # settable number of extruders.
         if machine_extruder_count and 0 <= machine_extruder_count <= len(extruder_dict):
             new_global_stack.setProperty("machine_extruder_count", "value", machine_extruder_count)
 

plugins/3MFReader/ThreeMFWorkspaceReader.py

@@ -666,7 +666,7 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
             # Printers with modifiable number of extruders (such as CFFF) will specify a machine_extruder_count in their
             # quality_changes file. If that's the case, take the extruder count into account when creating the machine
             # or else the extruderList will return only the first extruder, leading to missing non-global settings in
-            # the other extruders. See CURA-7646
+            # the other extruders.
             machine_extruder_count = self._getMachineExtruderCount()  # type: Optional[int]
             global_stack = CuraStackBuilder.createMachine(machine_name, self._machine_info.definition_id, machine_extruder_count)
             if global_stack:  # Only switch if creating the machine was successful.