Updated Texassemble (markdown)

Texassemble.md

@@ -46,7 +46,7 @@ The file-name parameter indicates the file(s) to use to create the assembled ima
 
 **-wrap**, **-mirror**: Sets the texture addressing mode for filtering to wrap or mirror, otherwise defaults to clamp. 
 
-**-wrap**, **-mirror**: Sets the texture addressing mode for filtering to wrap or mirror, otherwise defaults to clamp. 
+**-alpha**: Converts a premultiplied alpha image to non-premultiplied alpha (a.k.a. straight alpha).
 
 **-o _Output-filename_**: The default name is a ``.DDS`` file based on the first input image file. For cross/strip generation, the default is a ``.BMP`` file and you can specify any of the extensions supported for input.