spelling: successor

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

csharp/ql/lib/semmle/code/csharp/controlflow/internal/SuccessorType.qll

@@ -230,7 +230,7 @@ module SuccessorTypes {
    * }
    * ```
    *
-   * The node `return x;` is a `break` succedssor of the node `break;`.
+   * The node `return x;` is a `break` successor of the node `break;`.
    */
   class BreakSuccessor extends SuccessorType, TBreakSuccessor {
     override string toString() { result = "break" }