Cleanup: rename specials -> context_menu

In keeping with convention to match code & UI naming.

- No user visible changes.
- Include 'menu' in the name since context is an overloaded term.
- While a few of these are panels, from a user perspective they are
  still context menus.

release/scripts/startup/bl_ui/properties_object.py

@@ -158,7 +158,7 @@ class OBJECT_PT_relations(ObjectButtonsPanel, Panel):
         col.prop(ob, "pass_index")
 
 
-class COLLECTION_MT_specials(Menu):
+class COLLECTION_MT_context_menu(Menu):
     bl_label = "Collection Specials"
 
     def draw(self, context):
@@ -199,7 +199,7 @@ class OBJECT_PT_collections(ObjectButtonsPanel, Panel):
                 row = col.box().row()
                 row.prop(collection, "name", text="")
                 row.operator("object.collection_remove", text="", icon='X', emboss=False)
-                row.menu("COLLECTION_MT_specials", icon='DOWNARROW_HLT', text="")
+                row.menu("COLLECTION_MT_context_menu", icon='DOWNARROW_HLT', text="")
 
                 row = col.box().row()
                 row.prop(collection, "instance_offset", text="")
@@ -390,7 +390,7 @@ classes = (
     OBJECT_PT_transform,
     OBJECT_PT_delta_transform,
     OBJECT_PT_relations,
-    COLLECTION_MT_specials,
+    COLLECTION_MT_context_menu,
     OBJECT_PT_collections,
     OBJECT_PT_instancing,
     OBJECT_PT_instancing_size,