a CSTR #54 erratum with `ps` request

[G. Branden Robinson]

In case anyone never noticed,

> Any positive size value may be requested; if invalid, the next larger
> valid size result, with a maximum of 36.

Judging by the behavior of DWB 3.3 troff, this is incorrect in two
respects.

1.  The maximum type size is determined by the "sizes" directive in the
    output device's "DESC" file, and is not fixed at "36"; that's a
    C/A/T-ism.

2.  The "next larger valid size" is not selected; instead, the requested
    size is rounded to the nearest valid one, with ties rounding down.

Regards,
Branden

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