improve diagnostics in call parsing, patch suggested by
Matthijs Kooijman

llvm-svn: 49648
diff --git a/llvm/docs/tutorial/LangImpl2.html b/llvm/docs/tutorial/LangImpl2.html
index 50619e09..018d0be 100644
--- a/llvm/docs/tutorial/LangImpl2.html
+++ b/llvm/docs/tutorial/LangImpl2.html
@@ -337,7 +337,7 @@
       if (CurTok == ')') break;
     
       if (CurTok != ',')
-        return Error("Expected ')'");
+        return Error("Expected ')' or ',' in argument list");
       getNextToken();
     }
   }
@@ -1007,7 +1007,7 @@
       if (CurTok == ')') break;
     
       if (CurTok != ',')
-        return Error("Expected ')'");
+        return Error("Expected ')' or ',' in argument list");
       getNextToken();
     }
   }