ntp_adjtime.2: Increase visibility

+ s/ntp/ntpd/ for correctness + apropos results in document description
+ silence a linter warning by escaping a period with a zero-width space

MFC after:	3 days

lib/libsys/ntp_adjtime.2

@@ -27,13 +27,13 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd July 13, 2005
+.Dd March 22, 2026
 .Dt NTP_ADJTIME 2
 .Os
 .Sh NAME
 .Nm ntp_adjtime ,
 .Nm ntp_gettime
-.Nd Network Time Protocol (NTP) daemon interface system calls
+.Nd Network Time Protocol daemon (ntpd) interface system calls
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS
@@ -59,7 +59,7 @@ The time offset and related variables which are set by
 are used by
 .Fn hardclock
 to adjust the phase and frequency of the phase- or frequency-lock loop
-(PLL resp. FLL) which controls the system clock.
+(PLL resp\&. FLL) which controls the system clock.
 .Pp
 The
 .Fn ntp_gettime