fmt: fix spelling mistake in example
fmt: fix spelling mistake in example

Mea culpa. Beat Takeshi, sumimasen.

Fixes #31023.

Change-Id: Ie2f27a5867724a8a1b8c3082c3389c8fd6d1dee7
Reviewed-on: https://go-review.googlesource.com/c/go/+/168861
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

josharian/go,golang/go,cloudflare/go,cloudflare/go,nawawi/go,josharian/go,josharian/go,nawawi/go,cloudflare/go,akutz/go,golang/go,golang/go,CAFxX/go,cloudflare/go,akutz/go,nawawi/go,CAFxX/go,CAFxX/go,golang/go,akutz/go,nawawi/go,cloudflare/go,CAFxX/go,josharian/go,akutz/go,cloudflare/go,nawawi/go,golang/go,cloudflare/go,akutz/go,golang/go,nawawi/go,CAFxX/go,josharian/go,CAFxX/go,josharian/go,cloudflare/go,CAFxX/go,golang/go,josharian/go,nawawi/go,nawawi/go,josharian/go,akutz/go,akutz/go,CAFxX/go,akutz/go,golang/go