docs(dart-dio): add example for dio configuration

[tsinis]

Description

PR resolves an issue: getsentry/sentry-dart#2912 (review)

IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs to go live.

• Urgent deadline (GA date, etc.):
• Other deadline:
• None: Not urgent, can wait up to 1 week+

SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

EXTRA RESOURCES

• Sentry Docs contributor guide

[vercel]

@tsinis is attempting to deploy a commit to the Sentry Team on Vercel.

A member of the Team first needs to authorize it.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 7, 2025 8:13pm

2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
changelog	⬜️ Ignored (Inspect)	Visit Preview		May 7, 2025 8:13pm
develop-docs	⬜️ Ignored (Inspect)	Visit Preview		May 7, 2025 8:13pm

[buenaflor]

Made some modifications if you don't mind :)

@coolguyzone can be reviewed now

[coolguyzone]

Added a suggestion, looks good to me! Thanks for contributing 🏄‍♂️

[tsinis]

Noticed another thing in the docs today - asynchronous Sentry.captureMessage("My message"); call isn't awaited in the current docs, but being suggested to pass into the associatedEventId param, which expects SentryId?, not Future< SentryId?>. If you prefer me to do it in a separate PR, please let me know.

[buenaflor]

@coolguyzone it seems like some CI jobs are failing because this PR is coming from a fork. how do you typically handle external contributors?

or can you manually allow authorization for running the failing vercel jobs