Update the personal statement inset text

[JR-G]

Context

After a candidate has submitted an application choice we allow them to change their personal statement for future applications.

We need to render guidance to inform them that this change will not apply to previous application choices.

Changes proposed in this pull request

Before	After

Guidance to review

• Check the personal statement section – there should be no inset text
• Submit an application
• View the personal statement section again – personal statement specific text should appear
• Check other sections – should be the standard inset text

Link to Trello card

https://trello.com/c/u6JRkHFn/737-apply-missing-inset-when-editing-a-personal-statement-post-submission

Things to check

• If the code removes any existing feature flags, a data migration has also been added to delete the entry from the database
• This code does not rely on migrations in the same Pull Request
• If this code includes a migration adding or changing columns, it also backfills existing records for consistency
• If this code adds a column to the DB, decide whether it needs to be in analytics yml file or analytics blocklist
• API release notes have been updated if necessary
• If it adds a significant user-facing change, is it documented in the CHANGELOG?
• Required environment variables have been updated added to the Azure KeyVault

[github-actions]

Code Coverage

	Coverage type	From	To
⬇️	Lines covered	95.64%	95.1%

[github-actions]

Code Coverage

	Coverage type	From	To
⬇️	Lines covered	95.64%	95.32%

[Kateharries]

Looks good. Ideally it would be nice if all of this content was on one line. I had a few thoughts of how to change it but it ended up not being as clear as what's already there. We could try contracting the 'you have' to 'you've' @MaeveRoseveare ? This is no biggie though, and could just be something to return to :)