fix(learn): current sendMail typo

[TheUncertaintim]

Description

This PR fixed a few typos in the code snippets provided in the Learn/Asynchronous Work section.

Validation

Typo

The function named sendMail() is now mentioned correctly in the comment (instead of sendEmail())

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

[vercel]

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Jul 3, 2025 1:04pm

[avivkeller]

Requesting fast track

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟢 98	🟢 100	🟢 100	🟢 91	🔗
/en/about	🟢 100	🟢 96	🟢 100	🟠 82	🔗
/en/about/previous-releases	🟢 100	🟢 96	🟢 100	🟠 83	🔗
/en/download	🟢 98	🟢 100	🟢 100	🟢 91	🔗
/en/blog	🟢 100	🟢 100	🟢 96	🟢 92	🔗

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@a7ba5fc). Learn more about missing BASE report.
Report is 7 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7940   +/-   ##
=======================================
  Coverage        ?   75.40%           
=======================================
  Files           ?       96           
  Lines           ?     8354           
  Branches        ?      219           
=======================================
  Hits            ?     6299           
  Misses          ?     2053           
  Partials        ?        2           

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