shuf: correctly document --head-count

* src/shuf.c (usage): Correct --help output.
* doc/coreutils.texi: Correct option listing.
* NEWS: Mention correction.

NEWS

@@ -40,6 +40,9 @@ GNU coreutils NEWS                                    -*- outline -*-
   od no longer suffers from platform bugs in printf(3).  This is
   probably most noticeable when using 'od -tfL' to print long doubles.
 
+  shuf --head-count is now correctly documented.  The documentation
+  previously claimed it was called --head-lines.
+
 ** Improvements
 
   Improved support for access control lists (ACLs): On MacOS X, Solaris 7..10,

doc/coreutils.texi

@@ -4176,11 +4176,11 @@ operation modes:
 @table @samp
 
 @item -n @var{lines}
-@itemx --head-lines=@var{lines}
+@itemx --head-count=@var{count}
 @opindex -n
-@opindex --head-lines
+@opindex --head-count
 @cindex head of output
-Output at most @var{lines} lines.  By default, all input lines are
+Output at most @var{count} lines.  By default, all input lines are
 output.
 
 @item -o @var{output-file}

src/shuf.c

@@ -60,7 +60,7 @@ Mandatory arguments to long options are mandatory for short options too.\n\
       fputs (_("\
   -e, --echo                treat each ARG as an input line\n\
   -i, --input-range=LO-HI   treat each number LO through HI as an input line\n\
-  -n, --head-lines=LINES    output at most LINES lines\n\
+  -n, --head-count=COUNT    output at most COUNT lines\n\
   -o, --output=FILE         write result to FILE instead of standard output\n\
       --random-source=FILE  get random bytes from FILE (default /dev/urandom)\n\
   -z, --zero-terminated     end lines with 0 byte, not newline\n\