feat: update SNCF information regarding FIP access and ticket barriers

[lenderom]

No description provided.

[github-actions]

Hi there! 👋

Thank you for your contribution to the FIP Guide! 🚀
We appreciate your effort in making rail staff travel information more accessible. 🚄

Checklist before merging:

• Added a description to the Pull Request
• Checked the License of new pictures (non-commercial use without attribution)
• Modified content in English
• Modified content in German
• Modified content in French

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[MoritzWeber0]

Are you sure there is no call button to request support? According to this message in the FIP Guide community, there should at least one for disabled passengers, which can also be used when traveling with FIP (not sure if this also applies to the Paris area): https://discord.com/channels/1250522473188032512/1462058426745229355/1462814650642071683

[MoritzWeber0]

Ich habe mal versucht, es etwas präziser zu formulieren und habe noch ergänzt, dass die Hilfssprechanlagen nicht zuverlässig funktionieren. Schau gerne drüber, ob das für dich auch in Ordnung ist. Sonst können wir den commit auch reverten.