🎨 Fix header format for "Standard Input" in docs/tutorial/printing.md

[briancohan]

Based on the TOC and contents of the file, "Standard Input" does not appear to belong as a sub-item of "Standard Output" and "Standard Error". Header was changed from h3 ### to h2 ##.

[svlandeg]

I agree, "Standard Input" and "Standard output" should be at the same level :-)

Thanks for the PR!

[tiangolo]

Ah! Nice catch! That wasn't an obvious one. 🤓 Thanks @briancohan! 🍰

And thank you @svlandeg! 🍪 ☕

[github-actions]

📝 Docs preview for commit 86da27f at: https://627d5c5c52cb9c17e4589d4b--typertiangolo.netlify.app

[codecov]

Codecov Report

Merging #386 (86da27f) into master (dc26b21) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #386   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          252       252           
  Lines         5287      5287           
=========================================
  Hits          5287      5287           

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