st/oxr: codespell comment fix-up

Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2646>

src/xrt/state_trackers/oxr/oxr_face_tracking_android.c

···
 {
 	/*!
 	 * OXR_TWO_CALL_CHECK_* macro usage here is not technically necessary because validation
-	 * is handled in the API layer before this function is called, but we still re-use them here
+	 * is handled in the API layer before this function is called, but we still reuse them here
 	 * for declarative purposes of handling two-call patterns of setting capacities on the first call.
 	 */