Updated references to documentation from branch master to branch main.
stumbled over the reference to https://source.puri.sm/Librem5/feedbackd/-/blob/master/Event-naming-spec-0.0.0.md in man fbcli
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stumbled over the reference to https://source.puri.sm/Librem5/feedbackd/-/blob/master/Event-naming-spec-0.0.0.md in man fbcli
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