doc: adjust reference to info nodes in man pages

old form: coreutils '$cmd invocation'
new form: '(coreutils) $cmd invocation'

The old form erroneously referenced the node for the 'coreutils'
multi-call program.  Now that problematic node name was renamed
in commit v8.23-18-g72e470b, but the newer less ambiguous form
also has the advantage of working with the pinfo viewer for example.
Full discussion at http://bugs.gnu.org/18428

* man/local.mk: Adjust man page references to texinfo nodes.
* src/system.h: Adjust --help references to texinfo nodes.

man/dummy-man

@@ -69,5 +69,5 @@ The full documentation for
 is maintained as a Texinfo manual, which should be accessible
 on your system via the command
 .IP
-.B info coreutils $bs(aq$progname invocation$bs(aq
+.B info $bs(aq(coreutils) $progname invocation$bs(aq
 END

man/local.mk

@@ -102,7 +102,7 @@ man/dynamic-deps.mk: Makefile
 		     --source='$(PACKAGE_STRING)'			\
 		     --include=$(srcdir)/man/$$name.x			\
 		     --output=$$t/$$name.1 $$t/$$argv			\
-		     --info-page='coreutils \(aq'$$name' invocation\(aq' \
+		     --info-page='\(aq(coreutils) '$$name' invocation\(aq' \
 	  && sed \
 	       -e 's|$*\.td/||g' \
 	       -e '/For complete documentation/d' \

src/system.h

@@ -582,7 +582,8 @@ emit_ancillary_info (void)
                 last_component (program_name));
     }
   printf (_("For complete documentation, run: "
-            "info coreutils '%s invocation'\n"), last_component (program_name));
+            "info '(coreutils) %s invocation'\n"),
+          last_component (program_name));
 }
 
 static inline void