ddraw: Fix its vs it's typos.

dlls/ddraw/ddraw_private.h

@@ -180,7 +180,7 @@ struct ddraw_surface
      */
 #define MAX_COMPLEX_ATTACHED 6
     struct ddraw_surface *complex_array[MAX_COMPLEX_ATTACHED];
-    /* You can't traverse the tree upwards. Only a flag for Surface::Release because its needed there,
+    /* You can't traverse the tree upwards. Only a flag for Surface::Release because it's needed there,
      * but no pointer to prevent temptations to traverse it in the wrong direction.
      */
     BOOL                    is_complex_root;

dlls/ddraw/main.c

@@ -772,7 +772,7 @@ HRESULT WINAPI DllUnregisterServer(void)
  *
  * Params:
  *  surf: The enumerated surface
- *  desc: it's description
+ *  desc: its description
  *  context: Pointer to the ddraw impl
  *
  * Returns:

dlls/ddraw/tests/d3d.c

@@ -415,7 +415,7 @@ static void StateTest( void )
 {
     HRESULT rc;
 
-    /* The msdn says its undocumented, does it return an error too? */
+    /* The msdn says it's undocumented, does it return an error too? */
     rc = IDirect3DDevice7_SetRenderState(lpD3DDevice, D3DRENDERSTATE_ZVISIBLE, TRUE);
     ok(rc == D3D_OK, "IDirect3DDevice7_SetRenderState(D3DRENDERSTATE_ZVISIBLE, TRUE) returned %08x\n", rc);
     rc = IDirect3DDevice7_SetRenderState(lpD3DDevice, D3DRENDERSTATE_ZVISIBLE, FALSE);

dlls/ddraw/viewport.c

@@ -480,7 +480,7 @@ static HRESULT WINAPI d3d_viewport_TransformVertices(IDirect3DViewport3 *iface,
     }
 
     /* According to the d3d test, the offscreen flag is set only
-     * if exactly one vertex is transformed. Its not documented,
+     * if exactly one vertex is transformed. It's not documented,
      * but the test shows that the lpOffscreen flag is set to the
      * flag combination of clipping planes that clips the vertex.
      *
@@ -580,7 +580,7 @@ static HRESULT WINAPI d3d_viewport_GetBackground(IDirect3DViewport3 *iface,
 /*****************************************************************************
  * IDirect3DViewport3::SetBackgroundDepth
  *
- * Sets a surface that represents the background depth. It's contents are
+ * Sets a surface that represents the background depth. Its contents are
  * used to set the depth buffer in IDirect3DViewport3::Clear
  *
  * Params: