Add code snippets for ClearEditorPlugin and MarkdownShortcutPlugin

[NickRawls]

Adding missing code snippets for ClearEditorPlugin and MarkdownShortcutPlugin in react plugin.md and fixing typo in same file

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 14, 2024 4:03am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 14, 2024 4:03am

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Hi @NickRawls!

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[acywatson]

Beaut! If you sign the CLA, we'll merge it in :)

[NickRawls]

Beaut! If you sign the CLA, we'll merge it in :)

Thanks @acywatson ! I signed the CLA a couple of hours ago (~10:16AM CST). The form says the check should update the PR within 1 hour, so I'm not sure if it needs to be triggered again.

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