fixed doc for haxe.display.Position.character to "1-based" instead of "zero-based" (fixes #6782)

std/haxe/display/Position.hx

@@ -31,7 +31,7 @@ typedef Position = {
     var line:Int;
 
     /**
-        Character offset on a line in a document (zero-based).
+        Character offset on a line in a document (1-based).
     **/
     var character:Int;
 }
@@ -57,4 +57,4 @@ typedef Range = {
 typedef Location = {
     var file:String;
     var range:Range;
-}
+}