go_tutorial: change wording slightly and sync .txt and .html post-gofmt

Fixes #1211.

R=r, r2
CC=golang-dev
https://golang.org/cl/2635041
diff --git a/doc/go_tutorial.txt b/doc/go_tutorial.txt
index 477199a..9c08bd2 100644
--- a/doc/go_tutorial.txt
+++ b/doc/go_tutorial.txt
@@ -420,7 +420,7 @@
 	n.name = name
 	return n
 
-but for simple structures like "File" it's easier to return the address of a nonce
+but for simple structures like "File" it's easier to return the address of a 
 composite literal, as is done here on line 21.
 
 We can use the factory to construct some familiar, exported variables of type "*File":