_content/doc: use mysql.NewConfig() instead of mysql.Config{}

[methane]

The zero values for mysql.Config is not good for default.

See https://pkg.go.dev/github.com/go-sql-driver/mysql#Config

If a new Config is created instead of being parsed from a DSN string, the NewConfig function should be used, which sets default values.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[methane]

This tutorial confuses users.
go-sql-driver/mysql#1256

[gopherbot]

Message from Inada Naoki:

Patch Set 2:

(1 comment)

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[gopherbot]

Message from Zhen Li:

Patch Set 2:

(1 comment)

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[gopherbot]

This PR (HEAD: 1031334) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/website/+/582475.

Important tips:

• Don't comment on this PR. All discussion takes place in Gerrit.
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  • Push a new commit to the branch used by your GitHub PR.
  • A new "patch set" will then appear in Gerrit.
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  • Critical: you must click the blue Reply button near the top to publish your Gerrit responses.
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[gopherbot]

Message from Inada Naoki:

Patch Set 3:

(1 comment)

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