Slightly improve documentation of FT_Encoding.

include/freetype/freetype.h

@@ -519,10 +519,7 @@ FT_BEGIN_HEADER
   /* <Note>                                                                */
   /*    Despite the name, this enumeration lists specific character        */
   /*    repertories (i.e., charsets), and not text encoding methods (e.g., */
-  /*    UTF-8, UTF-16, GB2312_EUC, etc.).                                  */
-  /*                                                                       */
-  /*    Because of 32-bit charcodes defined in Unicode (i.e., surrogates), */
-  /*    all character codes must be expressed as FT_Longs.                 */
+  /*    UTF-8, UTF-16, etc.).                                              */
   /*                                                                       */
   /*    Other encodings might be defined in the future.                    */
   /*                                                                       */
@@ -536,6 +533,10 @@ FT_BEGIN_HEADER
   /*      Latin-1.  Most fonts include a Unicode charmap, but not all      */
   /*      of them.                                                         */
   /*                                                                       */
+  /*      For example, if you want to access Unicode value U+1F028 (and    */
+  /*      the font contains it), use value 0x1F028 as the input value for  */
+  /*      @FT_Get_Char_index.                                              */
+  /*                                                                       */
   /*    FT_ENCODING_MS_SYMBOL ::                                           */
   /*      Corresponds to the Microsoft Symbol encoding, used to encode     */
   /*      mathematical symbols in the 32..255 character code range.  For   */