fib: fix some typos in fib/mtrie

Type: fix

Change-Id: I1af0e4a9bc23a3b6b6d3a74df093801ab6cae1f8
Signed-off-by: Lijian Zhang <Lijian.Zhang@arm.com>
diff --git a/src/vnet/fib/fib_walk.c b/src/vnet/fib/fib_walk.c
index fca1bfe..a09e34d 100644
--- a/src/vnet/fib/fib_walk.c
+++ b/src/vnet/fib/fib_walk.c
@@ -127,7 +127,7 @@
 static const char * const fib_node_bw_reason_names[] = FIB_NODE_BW_REASONS;
 
 /**
- * A represenation of one queue of walk
+ * A representation of one queue of walk
  */
 typedef struct fib_walk_queue_t_
 {
@@ -738,7 +738,7 @@
  * @brief Back walk all the children of a FIB node.
  *
  * note this is a synchronous depth first walk. Children visited may propagate
- * the walk to thier children. Other children node types may not propagate,
+ * the walk to their children. Other children node types may not propagate,
  * synchronously but instead queue the walk for later async completion.
  */
 void