[x/blog] content: remove irrelevant bug documentation
[x/blog] content: remove irrelevant bug documentation

The aforementioned bug has been resolved in https://golang.org/cl/183991.
Removing it from the blog content reduces cognitive overhead for readers.

Change-Id: I19b944599d97895217e3178b31edf6a25c4c1fdc
GitHub-Last-Rev: b7ec54580b8d1cd9c37d261bb92d95d955696149
GitHub-Pull-Request: golang/blog#48
Reviewed-on: https://go-review.googlesource.com/c/blog/+/277612
Reviewed-by: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>
X-Blog-Commit: 4a950b243d00816dd0bbe7f3ccfd2f2c803666d4

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