gsdx: Remove some useless dx9 comments.

plugins/GSdx/GSdx.cpp

@@ -332,7 +332,7 @@ void GSdxApp::Init()
 
 	// Avoid to clutter the ini file with useless options
 
-	// PSX option (or DX9). Not supported on linux
+	// PSX option. Not supported on linux.
 #ifdef _WIN32
 	m_default_configuration["dithering"]                                  = "1";
 	m_default_configuration["ModeRefreshRate"]                            = "0";

plugins/GSdx/res/glsl/tfx_fs.glsl

@@ -439,7 +439,6 @@ vec4 sample_color(vec2 st)
         // Background in Shin Megami Tensei Lucifers
         // I suspect that uv isn't a standard number, so fract is outside of the [0;1] range
         // Note: it is free on GPU but let's do it only for float coordinate
-        // Strangely DX9 doesn't suffer from this issue.
         dd = clamp(dd, vec2(0.0f), vec2(1.0f));
 #endif
     }