Writed HTML kbd tag in standart format

[volkantash]

Why:

Closes [issue link]

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Content directory changes

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Source	Staging	Production	What Changed
content/get-started/using-github/keyboard-shortcuts.md	Modified	Original

[ramyaparimi]

@volkantash A PR was opened with this fix already, so I am going to close this PR 💛

Thanks so much for taking your time in contributing to the GitHub docs 💖