[PATCH] manual: Fix a format tag for a return value from 'nanosleep'

[Maciej W. Rozycki]

On Wed, 4 Jun 2025, Florian Weimer wrote:

> Them manual isn't consistent.  Three random examples:

 Indeed.  The use of @code is predominant but not universal, e.g. as per 
this approximation:

$ egrep -ir 'return.*@code{(-1|0|1)}' manual | wc -l
163
$ egrep -ir 'return.*@math{(-1|0|1)}' manual | wc -l
90
$ 

Fair enough then, let's leave it for a global cleanup either way sometime.  
I've dropped this change from patchwork now.

  Maciej