Fixed #34886 -- Modified sample use of lazy in delayed translations.

[lufafajoshua]

Modified example to use python standard library function to lower the case of the string.

Trac ticket number

ticket-34886

Branch description

The example to illustrate the use of lazy objects in delayed translations in django versions 4.2 and 4.1 has been updated to use a python standard library function.

Checklist

• This PR targets the main branch.
• The commit message is written in past tense, mentions the ticket number, and ends with a period.
• I have checked the "Has patch" ticket flag in the Trac system.
• I have added or updated relevant tests.
• I have added or updated relevant docs, including release notes if applicable.
• I have attached screenshots in both light and dark modes for any UI changes.

[sarahboyce]

Thank you! Looks good to me ⭐