Typo fix

include/TeX/flow.h

@@ -71,7 +71,7 @@ void TeX_flow_layout(struct TeX_Flow *flow, int display);
    This function performs a cursor action on a flow, like moving left or right.
    This is recursive, and should usually be called on the top-level flow.
    If it is called on a non-top-level flow, it will restrict the movement to
-   within the flow; the cursor will be to able to move within in but not exit.
+   within the flow; the cursor will be to able to move within it but not exit.
    Returns a cursorMoveResult enum; see edit.h for details of the return value. */
 enum cursorMoveResult TeX_flow_cursor_action(struct TeX_Flow * flow, struct editContext * context, enum cursorAction action);