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/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 7d9ced0..96a98d2 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -30,7 +30,7 @@
  *   0.1 F1OAT 07.06.98  Add timer polling routine for channel arbitration
  *   0.2 F6FBB 08.06.98  Added delay after FPGA programming
  *   0.3 F6FBB 29.07.98  Delayed PTT implementation for dupmode=2
- *   0.4 F6FBB 30.07.98  Added TxTail, Slottime and Persistance
+ *   0.4 F6FBB 30.07.98  Added TxTail, Slottime and Persistence
  *   0.5 F6FBB 01.08.98  Shared IRQs, /proc/net and network statistics
  *   0.6 F6FBB 25.08.98  Added 1200Bds format
  *   0.7 F6FBB 12.09.98  Added to the kernel configuration