Spelling fixes in comments (it's -> its)

* it's -> its (fixed for all files)
* dont -> don't (only fixed in a line which was touched by the previous fix)
* distrub -> disturb (fixed in the same line)

Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
diff --git a/qemu-file.h b/qemu-file.h
index 8da1021..31b83f6 100644
--- a/qemu-file.h
+++ b/qemu-file.h
@@ -47,7 +47,7 @@
  */
 typedef int (QEMUFileCloseFunc)(void *opaque);
 
-/* Called to determine if the file has exceeded it's bandwidth allocation.  The
+/* Called to determine if the file has exceeded its bandwidth allocation.  The
  * bandwidth capping is a soft limit, not a hard limit.
  */
 typedef int (QEMUFileRateLimit)(void *opaque);