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/sfc/mcdi.c b/drivers/net/sfc/mcdi.c
index 5e118f0..d984790 100644
--- a/drivers/net/sfc/mcdi.c
+++ b/drivers/net/sfc/mcdi.c
@@ -453,7 +453,7 @@
 	 *
 	 * There's a race here with efx_mcdi_rpc(), because we might receive
 	 * a REBOOT event *before* the request has been copied out. In polled
-	 * mode (during startup) this is irrelevent, because efx_mcdi_complete()
+	 * mode (during startup) this is irrelevant, because efx_mcdi_complete()
 	 * is ignored. In event mode, this condition is just an edge-case of
 	 * receiving a REBOOT event after posting the MCDI request. Did the mc
 	 * reboot before or after the copyout? The best we can do always is