doc: fix typo in go1.6.txt

Change-Id: I3bf1862c304ff08bfb87f84b6ccbb50204225244
Reviewed-on: https://go-review.googlesource.com/14407
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/doc/go1.6.txt b/doc/go1.6.txt
index a2f671c..9f138bf 100644
--- a/doc/go1.6.txt
+++ b/doc/go1.6.txt
@@ -8,5 +8,5 @@
 
 API additions and behavior changes:
 
-strconv: QuoteTOGraphic (https://golang.org/cl/14184/)
+strconv: QuoteToGraphic (https://golang.org/cl/14184/)
 text/template: ExecError (https://golang.org/cl/13957/)