Fix duplicated help_text for featured sections on HomePage

[SahuShweta]

Summary

This PR fixes Issue #450 where the help text for the "featured sections" field on the HomePage model duplicated the help text of the "Promo title" field.

Problem

Both fields had identical help_text values, which caused confusion in the admin interface as the description did not accurately reflect the purpose of the "featured sections" field.

Solution

Updated the help_text for the "featured sections" field to clearly describe its intended purpose.

• No field names were changed
• No field types were modified
• No functional behavior was altered
• Only the incorrect help_text was updated

Testing

• Ran migrations (if applicable)
• Executed python manage.py test
• All tests passed successfully

This change is minimal and addresses only Issue #450 without introducing unrelated modifications.

[thibaudcolas]

Thank you! Nice little improvement though I think for something like this it’s simpler and safe enough to edit the existing migration.