doc/go1.18: fix grammar error
doc/go1.18: fix grammar error

sed 's/the/that/g'

Change-Id: I3f539817b055d54b0ec99346555ac91b756d9ed6
GitHub-Last-Rev: 2e7df1c3462d4b3a17e9a05ff178341f4ee369b0
GitHub-Pull-Request: golang/go#51267
Reviewed-on: https://go-review.googlesource.com/c/go/+/386854
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Trust: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>

CAFxX/go,nawawi/go,golang/go,CAFxX/go,golang/go,cloudflare/go,golang/go,cloudflare/go,CAFxX/go,cloudflare/go,cloudflare/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,nawawi/go,golang/go,cloudflare/go,cloudflare/go,golang/go,cloudflare/go,nawawi/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,CAFxX/go,nawawi/go,cloudflare/go,nawawi/go,golang/go,nawawi/go