maintainers: format with nixfmt
maintainers: format with nixfmt

Vim cleaned up white space issues on its own from a hook so I decided to
take a look after running through nixfmt. The end result looks pretty
good to me, very minimal changes where everyting but the top-level
comment seems good to keep. I decided to keep the top-level comment
anyway so that future nixfmts would be minimal.

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