batman-adv: correct several typ0s in the comments

Several typos have been corrected and some sentences have been rephrased

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
diff --git a/net/batman-adv/unicast.h b/net/batman-adv/unicast.h
index 62f54b9..8fd5535 100644
--- a/net/batman-adv/unicast.h
+++ b/net/batman-adv/unicast.h
@@ -24,7 +24,7 @@
 
 #include "packet.h"
 
-#define FRAG_TIMEOUT 10000	/* purge frag list entrys after time in ms */
+#define FRAG_TIMEOUT 10000	/* purge frag list entries after time in ms */
 #define FRAG_BUFFER_SIZE 6	/* number of list elements in buffer */
 
 int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,