Removed duplicated words in in comments and docs.
diff --git a/Python/thread.c b/Python/thread.c
index dd333e8..c54670d 100644
--- a/Python/thread.c
+++ b/Python/thread.c
@@ -271,7 +271,7 @@
if (p->id == id && p->key == key)
goto Done;
/* Sanity check. These states should never happen but if
- * they do we must abort. Otherwise we'll end up spinning in
+ * they do we must abort. Otherwise we'll end up spinning
* in a tight loop with the lock held. A similar check is done
* in pystate.c tstate_delete_common(). */
if (p == prev_p)