Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/dvb/faq.txt b/Documentation/dvb/faq.txt
index 121832e..97b1373 100644
--- a/Documentation/dvb/faq.txt
+++ b/Documentation/dvb/faq.txt
@@ -106,7 +106,7 @@
 5. The dvb_net device doesn't give me any packets at all
 
 	Run tcpdump on the dvb0_0 interface. This sets the interface
-	into promiscous mode so it accepts any packets from the PID
+	into promiscuous mode so it accepts any packets from the PID
 	you have configured with the dvbnet utility. Check if there
 	are any packets with the IP addr and MAC addr you have
 	configured with ifconfig.