Update short URLs details component in /links-and-urls

[emmagifford]

Description

I've updated the 'Short URLs' details component in /using-nhs-notify/links-and-urls.

Context

It's emerged that GOV Notify's guidance on link shortening has now changed and they advise that GDS provide short URLs only for GOV.UK webpages.

As it's unlikely our users will link to GOV.UK pages in their comms, I've removed the line about GDS. I've added a line about requesting short URLs from your IT team, in line with GOV Notify's links and URLs content. This is the only relevant advice as there doesn't seem to ben an official NHS link shortening service. This was confirmed in the general Teams chat.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.