minor docs fix
original commit: 5128f08810ec027fdb6569750d302930e3cd0519
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@ -352,17 +352,16 @@ the state transitions / contracts are:
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preferences:set
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(symbol? any/c . -> . void?)
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(symbol value)
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@{See also @racket[preferences:set-default].
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@racket[preferences:set-preference] sets the preference
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@racket[symbol] to @racket[value]. This should be called when the
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users requests a change to a preference.
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This function immediately writes the preference value to disk.
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It raises
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@index['("exn:unknown-preference")]{@racket[exn:unknown-preference]}
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if the preference's default has not been set.})
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@{Sets the preference
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@racket[symbol] to @racket[value]. It should be called when the
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users requests a change to a preference.
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@racket[preferences:set] immediately writes the preference value to disk.
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It raises
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@index['("exn:unknown-preference")]{@racket[exn:unknown-preference]}
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if the preference's default has not been set.
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See also @racket[preferences:set-default].})
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(proc-doc/names
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preferences:add-callback
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