Update CloudflareTunnel.md with info to prevent error when setting OVERWRITEHOST #2808
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Added note about clearing Host field when setting OVERWRITEHOST environment variable. Otherwise you will get this error "Environment Variable [OVERWRITEHOST] in [envList] tried to override the Environment Variable that is already defined in [Secret - nextcloud-creds]"
Please see this post where I asked how to fix the error I was getting: https://forums.truenas.com/t/unable-set-set-overwritehost-variable-for-nextcloud-cloudflare-reverse-proxy/5659