Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 88485cc..cc4d3c5 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -169,7 +169,7 @@
 	spin_unlock_bh(&br->hash_lock);
 }
 
-/* Flush all entries refering to a specific port.
+/* Flush all entries referring to a specific port.
  * if do_all is set also flush static entries
  */
 void br_fdb_delete_by_port(struct net_bridge *br,