docs(cloudflare): set ttl annotation for cloudflare proxied entries to 1

[jerome-lecorvaisier]

#992 - External-DNS delete and recreate constantly all DNS record

Proposed Changes

• Add documentation about TTL annotation with Cloudflare proxied entries.

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[njuettner]

/lgtm
/approve

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[aspekt112]

What is root cause for the change?