_content/blog/: fix typo
_content/blog/: fix typo

Assuming 'though' should be 'through'

Change-Id: I33e3e86ee84510f771395cce62cb9ce18d5dcebe
Reviewed-on: https://go-review.googlesource.com/c/website/+/350289
Reviewed-by: Filippo Valsorda <4f40cda291c5f9634e1affd3db44947af61f705c@golang.org>
Run-TryBot: Filippo Valsorda <4f40cda291c5f9634e1affd3db44947af61f705c@golang.org>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Trust: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Website-Publish: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

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