[x/blog] content: fix wording in slices article
[x/blog] content: fix wording in slices article

Change-Id: I12e60070e6bdb0b0f1bd4bf203382c0e4b4de9e8
Reviewed-on: https://go-review.googlesource.com/19536
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>
X-Blog-Commit: 41ca9dfe6044e089c8209bdced0bd5dbdb3bcbed

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website