[x/blog] Fix link to the Bug section of pkg/bytes godoc
[x/blog] Fix link to the Bug section of pkg/bytes godoc

Correct link should point to http://golang.org/pkg/bytes/#pkg-note-BUG

Change-Id: I6b493fd49f43103c507c3ff61ff1f5b9b780f171
Reviewed-on: https://go-review.googlesource.com/1953
Reviewed-by: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
X-Blog-Commit: 702ebab8a695bb51f7d3cd88f32c12a84935955a

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