[DOCS]: Fix a code block in docs/components/assets.rst in branch 5.2

[adiati98]

Description

The code block in the "Add UTM codes to Asset" section in docs/components/assets.rst is out of the box. See the screenshot.

Relevant Documentation URL

https://docs.mautic.org/en/5.2/components/assets.html#add-utm-codes-to-asset

Are you willing to help us fix this by making a pull request?

No

Suggestions (Optional)

Fix the code block. Look at line 63 as an example.

Screenshots or Screen Recordings (Optional)

[adi-ray]

I'd like to work on this

[adiati98]

@adi-ray we've assigned this issue to you. 👍🏼