Small doc fixes about the list of supported codecs.

Change-Id: I98b8ec9d5de9e69f1bb6187b4d820d61f7ce03e5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/codecs/qtextcodec.cpp

@@ -370,8 +370,6 @@ QTextCodec::ConverterState::~ConverterState()
     \li JIS X 0208
     \li KOI8-R
     \li KOI8-U
-    \li MuleLao-1
-    \li ROMAN8
     \li \l{Shift-JIS Text Codec}{Shift-JIS}
     \li TIS-620
     \li \l{TSCII Text Codec}{TSCII}
@@ -383,9 +381,11 @@ QTextCodec::ConverterState::~ConverterState()
     \li UTF-32BE
     \li UTF-32LE
     \li Windows-1250 to 1258
-    \li WINSAMI2
     \endlist
 
+    If Qt is compiled with ICU support enabled, most codecs supported by
+    ICU will also be available to the application.
+
     QTextCodecs can be used as follows to convert some locally encoded
     string to Unicode. Suppose you have some string encoded in Russian
     KOI8-R encoding, and want to convert it to Unicode. The simple way