Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/atm/lanai.c b/drivers/atm/lanai.c
index 52880c8..4e8ba56 100644
--- a/drivers/atm/lanai.c
+++ b/drivers/atm/lanai.c
@@ -1255,7 +1255,7 @@
 	/*
 	 * Since the "butt register" is a shared resounce on the card we
 	 * serialize all accesses to it through this spinlock.  This is
-	 * mostly just paranoia sicne the register is rarely "busy" anyway
+	 * mostly just paranoia since the register is rarely "busy" anyway
 	 * but is needed for correctness.
 	 */
 	spin_lock(&lanai->endtxlock);
@@ -1990,7 +1990,7 @@
 
 /*
  * We _can_ use VCI==0 for normal traffic, but only for UBR (or we'll
- * get a CBRZERO interrupt), and we can use it only if noone is receiving
+ * get a CBRZERO interrupt), and we can use it only if no one is receiving
  * AAL0 traffic (since they will use the same queue) - according to the
  * docs we shouldn't even use it for AAL0 traffic
  */