Updated group description for European Chess Federation

Updated group description for European Chess Federation:

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This is the chess.com site for the European Chess Federation (ECF), to promote all forms of chess throughout Europe. Membership is open to everyone, and it's here that you'll find details, scoretables etc. of the many great inter-country matches arranged by us under the banner of the European League. Please explore the site to see how it works, and don't hesitate to contact one of the admins if you have any questions.

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This team is for admins of European national and regional teams.

The team is also the main headquarter for:
- European League
- European Championships
- Team Europe