Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/net/znet.c b/drivers/net/znet.c
index ae07b3d..ec2800f 100644
--- a/drivers/net/znet.c
+++ b/drivers/net/znet.c
@@ -652,7 +652,7 @@
 					dev->stats.tx_errors++;
 
 				/* Transceiver may be stuck if cable
-				 * was removed while emiting a
+				 * was removed while emitting a
 				 * packet. Flip it off, then on to
 				 * reset it. This is very empirical,
 				 * but it seems to work. */