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Fix typo in `conf-pulseaudio` opam file

Changed files
+1 -1
packages
conf-pulseaudio
conf-pulseaudio.1
+1 -1
packages/conf-pulseaudio/conf-pulseaudio.1/opam
···
["pulseaudio"] {os = "freebsd" }
["libpulseaudio"] { os-distribution = "nixos" }
["libpulse"] { os-family = "arch" }
-
["libpulse-dev"] {os-family = "debian" | os-family = "ubunty"}
+
["libpulse-dev"] {os-family = "debian" | os-family = "ubuntu"}
]
synopsis: "Virtual package relying on pulseaudio"
description: