updates for exercise 4

Author: bocon13

EXERCISE-4.md

@@ -340,7 +340,7 @@ reloading the app:
 If you left the ping between `h2` and `h1a` running, check that terminal window,
 it should work now!
 
-To verify tha ping works also for hosts attached to different leaves, let's
+To verify that ping works also for hosts attached to different leaves, let's
 start a new ping between `h2` and `h3` with the following commands, in order:
 
 ```

p4src/main.p4

@@ -558,11 +558,14 @@ control IngressPipeImpl (inout parsed_headers_t    hdr,
     //   * provide action "ndp_ns_to_na" defined before
     //   * default_action should be "NoAction"
     //
+    // You can name your table whatever you like, and you will need to fill
+    // the name in elsewhere in this exercise.
+    //
     // This table should have structure similar to l2_exact_table defined
     // before. Feel free to copy paste that table definition here as a starter.
     // ---- START SOLUTION ----
 
-    /* Provide your table impolementation here */
+    /* Provide your table implementation here */
 
     // ---- END SOLUTION ----