Name Description (.Nd macro) added.

Style and punctuation errors fixes.
ERRORS section included to RETURN VALUES because it's
describing return values instead of errors and their handling.

Reviewed by:	mpp

lib/libc/sys/nanosleep.2

@@ -40,6 +40,7 @@
 .Os 
 .Sh NAME
 .Nm nanosleep
+.Nd suspend process execution for an interval measured in nanoseconds
 .Sh SYNOPSIS
 .Fd #include <time.h>
 .Ft int
@@ -50,7 +51,7 @@ causes the process to sleep for the specified time.  An unmasked signal will
 cause it to terminate the sleep early, regardless of the
 .Dv SA_RESTART
 value on the interrupting signal.
-.Sh RETURN VALUE
+.Sh RETURN VALUES
 If the 
 .Fn nanosleep
 function returns because the requested time has elapsed, the value
@@ -68,12 +69,12 @@ is
 .Pf non- Dv NULL ,
 the timespec structure it references is updated to contain the
 unslept amount (the request time minus the time actually slept).
-.Sh ERRORS
+.Pp
 If any of the following conditions occur, the
-.Nm 
+.Fn nanosleep 
 function shall return -1 and set
 .Va errno
-to the corresponding value.
+to the corresponding value:
 .Bl -tag -width Er
 .It Bq Er EFAULT
 Either
@@ -83,14 +84,14 @@ or
 points to memory that is not a valid part of the process
 address space.
 .It Bq Er EINTR
-.Nm
+.Fn nanosleep
 was interrupted by the delivery of a signal.
 .It Bq Er EINVAL
 .Fa rqtp
 specified a nanosecond value less than zero
 or greater than or equal to 1000 million.
 .It Bq Er ENOSYS
-.Nm
+.Fn nanosleep
 is not supported by this implementation.
 .El
 .Sh SEE ALSO