The precision for "%s" is ignored.  Either the man page or the
code are wrong.

How-To-Repeat: This code:
main()
{
	printf("precision = 4\n%4s",
"if a precision is specified, no more than the number specified are written.\n");
}

produces this output:

> precision = 4
> if a precision is specified, no more than the number specified are written.

"man 3 printf" says;

> The ``char *'' argument is expected to be a pointer to an array
>            of character type (pointer to a string).  Characters from the ar-
>            ray are written up to (but not including) a terminating NUL char-
>            acter; if a precision is specified, no more than the number spec-
>            ified are written. If a precision is given, no null character
>            need be present; if the precision is not specified, or is greater
>            than the size of the array, the array must contain a terminating
>            NUL character.