docs: fix simple typo, transiton -> transition
There is a small typo in src/shims/lock.h.
Should read `transition` rather than `transiton`.
@@ -564,7 +564,7 @@ typedef struct dispatch_once_gate_s {
* effect of the dispatch once initialization.
*
* Per Lemma 2, when the DONE transition happens in a thread zone { N+3, N+4 },
- * then threads can observe this transiton in their { N+2, N+3 } zone at the
+ * then threads can observe this transition in their { N+2, N+3 } zone at the
* earliest.
*
* Hence for an initializer bracket of { N, N+1 }, the first safe bracket for
