_content/package-names: remove usage of "stutter"

Replace the use of "stutter" with a word which
more clearly conveys the meaning.

Change-Id: Ib1278d9eb24f5c84ed1f6e121493b6690f549687
Reviewed-on: https://go-review.googlesource.com/c/blog/+/322633
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Sameer Ajmani <ajmani@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

_content/package-names.article

diff --git a/_content/package-names.article b/_content/package-names.article
index 48c0eb6..b28b73e 100644
--- a/_content/package-names.article
+++ b/_content/package-names.article
@@ -74,7 +74,7 @@
 together.
 When designing a package, take the client's point of view.
 
-**Avoid stutter.**
+**Avoid repetition.**
 Since client code uses the package name as a prefix when referring to the
 package contents, the names for those contents need not repeat the package name.
 The HTTP server provided by the `http` package is called `Server`, not