fib: doc nitfixes

Type: improvement

Change-Id: I29346c849a5e1ff3c2ea399671f9f50d075e9f18
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
diff --git a/src/vnet/fib/mpls_fib.h b/src/vnet/fib/mpls_fib.h
index 33eaa88..e7ea5d5 100644
--- a/src/vnet/fib/mpls_fib.h
+++ b/src/vnet/fib/mpls_fib.h
@@ -54,7 +54,7 @@
 
   /**
    * The load-balance indices keyed by 21 bit label+eos bit.
-   * A flat array for maximum lookup performace.
+   * A flat array for maximum lookup performance.
    */
   index_t mf_lbs[MPLS_FIB_DB_SIZE];
 } mpls_fib_t;