netgraph: Fix two typos in source code comments

- s/bascially/basically/
- s/simpliest/simplest/

MFC after:	3 days

sys/netgraph/ng_sample.h

@@ -73,7 +73,7 @@ struct ngxxxstat {
 
 /*
  * This is used to define the 'parse type' for a struct ngxxxstat, which
- * is bascially a description of how to convert a binary struct ngxxxstat
+ * is basically a description of how to convert a binary struct ngxxxstat
  * to an ASCII string and back.  See ng_parse.h for more info.
  *
  * This needs to be kept in sync with the above structure definition

sys/netgraph/ng_tag.c

@@ -258,7 +258,7 @@ NETGRAPH_INIT(tag, &typestruct);
  * One could ask why to have this structures at all when we have
  * ng_tag_hookinfo initialized to zero and don't need in and out structures
  * at all to operate.  Unfortunatelly, we have to return thisHook field
- * in response to messages so the fastest and simpliest way is to have
+ * in response to messages so the fastest and simplest way is to have
  * this default structures and initialize thisHook once at hook creation
  * rather than to do it on every response.
  */