updated the example grammar for zaach#348 to mirror the latest state …

…of affairs, where the default grammar production value assignment code `$$ = $1` (default-action-mode=classic) is injected also when there actually **is** an action block present, **IFF** said action block does not assign a value to `$$` itself.

examples/issue-348.jison

@@ -265,7 +265,7 @@ end mc
 
     var rv = parser.parse(input);
     console.log("test #1: ==> ", rv);
-    assert.equal(rv, true, "test returns TRUE because the start rule has an action block, so no default action inserted and $$ has been set to UNDEFINED then");
+    assert.equal(rv, "define", "test returns TRUE because the start rule has an action block, so no default action inserted and $$ has been set to $1 === 'DEFINE' then");
 
     // if you get past the assert(), you're good.
     console.log("tested OK");