Re: PG 16 draft release notes ready

The v16 release notes are problematic in a PDF docs build:

[WARN] FOUserAgent - Glyph "?" (0x142, lslash) not available in font "Times-Roman".

This is evidently from

Add functions to add, subtract, and generate timestamptz values in a specified time zone (Przemysław Sztoch, Gurjeet
Singh)

Change date_trunc(unit, timestamptz, time_zone) to be an immutable function (Przemysław Sztoch)

since "ł" doesn't exist in ISO8859-1.  I'd suggest dumbing these
down to plain "l".

            regards, tom lane