bug#50731: `progress-reporter-update' docstring and `backward-sexp' interaction

[Lars Ingebrigtsen]

Stefan Kangas <stefan@marxist.se> writes:

> The docstring of `progress-reporter-update' contains the following text:
>
>     If REPORTER is a numerical progress reporter---i.e. if it was
>      made using non-nil MIN-VALUE and MAX-VALUE arguments to
>      `make-progress-reporter'---then VALUE should be a number between
>      MIN-VALUE and MAX-VALUE.

I think the ---s here should just be made into parentheses.

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