/usr/share/fish/completions/renice.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | complete -c renice -s p --description "Force following parameters to be process ID's (The default)"
complete -c renice -s g --description "Force following parameters to be interpreted as process group ID's"
complete -c renice -s u --description "Force following parameters to be interpreted as user names"
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