Documentation: Fix typo in multiple files in Documentation

Correct multiple spelling typo in Documentation.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Rob Landley <rob@landley.net>
Reported-by: Anders Larsen <al@alarsen.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/dvb/opera-firmware.txt b/Documentation/dvb/opera-firmware.txt
index 93e784c..fb66831 100644
--- a/Documentation/dvb/opera-firmware.txt
+++ b/Documentation/dvb/opera-firmware.txt
@@ -8,7 +8,7 @@
 
 Then run
 
-./get_dvb_firware opera1
+./get_dvb_firmware opera1
 
 and after that you have 2 files:
 
@@ -24,4 +24,4 @@
 in kernel config and have hotplug running).
 
 
-Marco Gittler <g.marco@freenet.de>
\ No newline at end of file
+Marco Gittler <g.marco@freenet.de>