design/16085-conversions-ignore-tags.md: fix a couple of typos

Change-Id: Ia3cdfbe162f8d218517574071e64a5aece3af36b
Reviewed-on: https://go-review.googlesource.com/24280
Reviewed-by: Robert Griesemer <[email protected]>

Author: griesemer

design/16085-conversions-ignore-tags.md

@@ -94,9 +94,9 @@ we will be able to access a value of *jsonPerson type
 	person := new(jsonPerson)
 	// some code that populates person
 
-as a *Txml:
+as an *xmlPerson:
 
-	alias := (*xmlPerson)(&person)
+	alias := (*xmlPerson)(person)
 	// some code that uses alias
 
 This may eliminate the need to copy struct values just to change the tags.