update comments

command/format/diff.go

@@ -374,6 +374,16 @@ func (p *blockBodyDiffPrinter) writeAttrDiff(name string, attrS *configschema.At
 	return false
 }
 
+// TODO: writeNestedAttrDiff will be responsible for properly formatting
+// Attributes with NestedTypes in the diff. Right now, we are letting the
+// existing formatter "just" print these attributes like regular, object-type
+// attributes. Unlike the regular attribute printer, this function will need to
+// descend into the NestedType to ensure that we are properly handling items
+// such as:
+//   - nested sensitive fields
+//   - which nested field specifically requires replacement
+//
+// Examples of both can be seen in diff_test.go with FIXME comments.
 func (p *blockBodyDiffPrinter) writeNestedAttrDiff(name string, attrS *configschema.Attribute, old, new cty.Value, nameLen, indent int, path cty.Path) bool {
 	panic("not implemented")
 }

command/format/diff_test.go

@@ -326,7 +326,7 @@ new line
 				Attributes: map[string]*configschema.Attribute{
 					"id":       {Type: cty.String, Computed: true},
 					"password": {Type: cty.String, Optional: true, Sensitive: true},
-					// TODO: This is a temporary situation; once the NestedType
+					// FIXME: This is a temporary situation; once the NestedType
 					// specific printer is implemented this will need to be
 					// updated so that only the sensitive nested attribute is
 					// hidden.