feh(1): replace yudit with NotoSans-Medium in examples

Set global font.

Should be a truetype font, resident in the current directory or the font

directory, and should be defined in the form fontname/size, like

.Qq yudit/12

.Qq NotoSans-Medium/12

.Pq which is the default .

.

.It Cm \-C , \-\-fontpath Ar path

.

Use

.Ar font

.Pq truetype, with size, like Qq yudit/12

.Pq truetype, with size, like Qq NotoSans-Medium/12

as menu font.

.

.It Cm \-\-min\-dimension Ar width No x Ar height