Clarify self in comments

Author: josephschorr

pkg/namespace/builder.go

@@ -203,7 +203,7 @@ func Nil() *core.SetOperation_Child {
 	}
 }
 
-// Self creates a child for a set operation that references the subject itself.
+// Self creates a child for a set operation that references the resource itself as a subject.
 func Self() *core.SetOperation_Child {
 	return &core.SetOperation_Child{
 		ChildType: &core.SetOperation_Child_XSelf{},

pkg/proto/core/v1/core.pb.go

@@ -422,7 +422,7 @@ message SetOperation {
     message This {}
     message Nil {}
 
-    // `self` refers to the subject in a permission computation.
+    // `self` refers to the resource-as-a-subject in a permission computation.
     message Self {}
 
     oneof child_type {