Docs/iAPI: Fix wrong code snippets in API reference

[atachibana]

What?

The snippets in the API reference contain some errors:

wp-context sample

• missing quotes

wp-init sample

• Since getElement() appears for the first time on this page, it should be mentioned that this function needs to be imported.
• </> should be </p>

Derived state sample

• Last comma should be semi colon.

getElement sample

• invalid comment and output json

withScope sample

• missing bracket

wp_interactivity_process_directives

• wrong namespace

Some minor typos were also fixed.

Why?

How?

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions]

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Co-authored-by: atachibana <atachibana@git.wordpress.org>
Co-authored-by: shail-mehta <shailu25@git.wordpress.org>

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[shail-mehta]

LGTM 👍

[atachibana]

@shail-mehta
Thank you. Can I ask this merge?

[shail-mehta]

@atachibana

Could you please rebase the branch with the trunk so I can merge it? (</p> tag closing issue was fixed in last week. I apologize, I didn't notice this PR at that time.)

[atachibana]

@shail-mehta
I have updated it. I hope this can be merged correctly.

[shail-mehta]

Thanks for the Update @atachibana.