ENH: add '-help-notes' as an advanced option

- emits the notes description only

src/OpenFOAM/global/argList/argList.C

@@ -878,6 +878,12 @@ void Foam::argList::parse
             printUsage(true);
             quickExit = true;
         }
+        else if (options_.found("help-notes"))
+        {
+            printNotes();
+            Info<< nl;
+            quickExit = true;
+        }
         else if (options_.found("help"))
         {
             printUsage(false);

src/OpenFOAM/global/argList/argListHelp.C

@@ -314,6 +314,7 @@ void Foam::argList::printMan() const
     }
 
     printManOption("help-man", "Display full help (manpage format) and exit");
+    printManOption("help-notes", "Display help notes (description) and exit");
 
     printManCompat();
 
@@ -407,6 +408,7 @@ void Foam::argList::printUsage(bool full) const
     if (full)
     {
         printOption("help-man", "Display full help (manpage format) and exit");
+        printOption("help-notes", "Display help notes (description) and exit");
     }
 
     printOption("help-full", "Display full help and exit");