Misc spelling fixes.

diff --git a/windows/win.c b/windows/win.c
index 551d56c..1017c92 100644
--- a/windows/win.c
+++ b/windows/win.c
@@ -235,7 +235,7 @@
  *           WIN_GetPtr
  *
  * Return a pointer to the WND structure if local to the process,
- * or WND_OTHER_PROCESS is handle may be valid in other process.
+ * or WND_OTHER_PROCESS if handle may be valid in other process.
  * If ret value is a valid pointer, it must be released with WIN_ReleasePtr.
  */
 WND *WIN_GetPtr( HWND hwnd )