Update keyboard-shortcuts.mdAdd missing source code editing shortcut

[duvvuvenkataramana]

Adds Ctrl+E / Command+E shortcut to the Source Code Editing section as reported in #41394.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

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• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
get-started/accessibility/keyboard-shortcuts.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14

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[duvvuvenkataramana]

Hi @github/docs-content-core-team 👋,
Could someone please review this PR when you get a chance?

It’s a small documentation update adding the missing Ctrl+E / Command+E shortcut (from issue #41394).
All checks have passed and the branch is ready for review.

Thank you! 🙌

[Sharra-writes]

@duvvuvenkataramana The person who opened the issue also opened a PR, and it was merged earlier today.