database/sql: fix typo in comment
database/sql: fix typo in comment

Fixes #43116

Change-Id: Ib04fab6ae03f322aa1508ec00523f628d891247a
GitHub-Last-Rev: 0a86e665b2c320e0b2aef75ee53bd7281b19b013
GitHub-Pull-Request: golang/go#43122
Reviewed-on: https://go-review.googlesource.com/c/go/+/276992
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Reviewed-by: Daniel Theophanes <14db39248b80c6688f7e9808ba5055f2e56426f3@gmail.com>

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