doc: output correct --help references with --program-prefix

* src/system.h (emit_ancillary_info): Take the invariant PROGRAM_NAME
as a parameter, so that consistent references are made to online docs
and texinfo nodes, when a --program-prefix is in place.  Note the
man pages don't need this fix as they're generated before the program
prefix is used.
* NEWS: Mention the improvements in references to online documentation.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/stat.c b/src/stat.c
index c78ab70d0..a739ae77b 100644
--- a/src/stat.c
+++ b/src/stat.c
@@ -1491,7 +1491,7 @@ Valid format sequences for file systems:\n\
   %T   file system type in human readable form\n\
 "), stdout);
       printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
-      emit_ancillary_info ();
+      emit_ancillary_info (PROGRAM_NAME);
     }
   exit (status);
 }