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/tail.c b/src/tail.c
index 7dd3f4a44..f5d258517 100644
--- a/src/tail.c
+++ b/src/tail.c
@@ -321,7 +321,7 @@ track the actual name of the file, not the file descriptor (e.g., log\n\
 rotation).  Use --follow=name in that case.  That causes tail to track the\n\
 named file in a way that accommodates renaming, removal and creation.\n\
 "), stdout);
-      emit_ancillary_info ();
+      emit_ancillary_info (PROGRAM_NAME);
     }
   exit (status);
 }