Update dev-guide-sample-application-python-pymysql.md

[jyf111]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Fix #15937.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.4 (TiDB 7.4 versions)
• v7.3 (TiDB 7.3 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
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• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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Do your changes match any of the following descriptions?

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[ti-chi-bot]

Welcome @jyf111!

It looks like this is your first PR to pingcap/docs-cn 🎉.

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Thank you, and welcome to pingcap/docs-cn. 😃

[Icemap]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-15 14:27:23.391553628 +0000 UTC m=+193284.955851329: ☑️ agreed by Icemap.
• 2024-01-24 12:14:36.316568993 +0000 UTC m=+962917.880866698: ☑️ agreed by qiancai.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #16306.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16307.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.3: #16308.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16309.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16310.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16311.