small docu patch for TChain::Add()

Hello,

the wildcard behaviour of TChain::Add() caused me a bit of a headache, so I thought I'd send in a patch to clarify its documentation a bit.

Kind regards,

Thiemo

-- 
+-----------------------------------+--------------------------+


| Dipl.-Phys. Thiemo Nagel          |                          |

| Technische Universitaet Muenchen  | Room    PH1 3276         |

| Physik-Department E18             |                          |

| James-Franck-Strasse              | Phone  +49 89 289-12379  |

| D-85747 Garching                  | Fax    +49 89 289-12570  |

+-----------------------------------+--------------------------+


--- TChain.cxx	2009-02-19 22:16:26.000000000 +0100
+++ TChain.cxx.new	2009-02-19 22:20:05.000000000 +0100
@@ -241,8 +241,9 @@
    //   //machine/file_name.root/subdir/tree_name
    // machine, subdir and tree_name are optional. If tree_name is missing,
    // the chain name will be assumed.
-   // Name may use the wildcarding notation, eg "xxx*.root" means all files
-   // starting with xxx in the current file system directory.
+   // In the file name part (but not in preceding directories) wildcarding
+   // notation may be used, eg. specifying "xxx*.root" adds all files starting
+   // with xxx in the current file system directory.
    // NB. To add all the files of a TChain to a chain, use Add(TChain *chain).
    //
    //    A- if nentries <= 0, the file is connected and the tree header read