Tweak readme wording to try and help users with first time setup

[thespad]

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• [x] I have read the contributing guideline and understand that I have made the correct modifications

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[LinuxServer-CI]

I am a bot, here is the pushed image/manifest for this PR:

ghcr.io/linuxserver/lspipepr-unifi-network-application:7.5.176-pkg-3f48ad74-dev-f2e9fb1a1228947dd0326f2c876f9124c2a09a2f-pr-18