[x/blog] content: fixed broken url for Stanford CSC talk
[x/blog] content: fixed broken url for Stanford CSC talk

Looks like Stanford moved the Computer Systems Colloquium talks to
their youtube channel.

Change-Id: Ib93da9c12904ae4470218195bd82be7ebd9f3b8d
Reviewed-on: https://go-review.googlesource.com/69070
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
X-Blog-Commit: a79a44d5044d1684c3dea1fb53e932f589bb0739

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