[x/blog] blog: update article pointing to wrong location
[x/blog] blog: update article pointing to wrong location

Out of date content regarding the location of panic
and recover. Updated to point to correct location inside
encode rather than decode.

Fixes golang/go#30170

Change-Id: I798343b3405ee84bb509d97e88b7e642ffc4d1e3
Reviewed-on: https://go-review.googlesource.com/c/blog/+/176757
Reviewed-by: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Reviewed-by: Andrew Bonventre <682ad9f487f614f19e8b7cc5d340bdc8e1c1b128@golang.org>
X-Blog-Commit: e28c63452d3612c1af694235273469c8afe9f4cd

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