doc: in go1.6.txt, small changes to fmt and time

Change-Id: Ie86b703407f0f655a4552dd6e03df5f263be43db
Reviewed-on: https://go-review.googlesource.com/14492Reviewed-by: Rob Pike <r@golang.org>

doc/go1.6.txt

@@ -8,6 +8,8 @@ NaCl is no longer restricted to pepper_41 (https://golang.org/cl/13958/)
 
 API additions and behavior changes:
 
+fmt: allow any integer type as an argument to the * operator (https://golang.org/cl/14491/)
 strconv: QuoteToGraphic (https://golang.org/cl/14184/)
 text/template: ExecError (https://golang.org/cl/13957/)
 text/template: trimming spaces (https://golang.org/cl/14391/)
+time: allow one and two-digit days of the month during Parse (https://golang.org/cl/14123/)
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